{"cik":1282977,"taxonomy":"us-gaap","tag":"CommonStockValue","label":"Common Stock, Value, Issued","description":"Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.","entityName":"GREENHILL & CO., INC.","units":{"USD":[{"end":"2009-12-31","val":332543,"accn":"0000950123-10-074660","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-09"},{"end":"2009-12-31","val":332543,"accn":"0000950123-10-097539","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-28"},{"end":"2009-12-31","val":332543,"accn":"0000950123-11-019920","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2009Q4I"},{"end":"2010-06-30","val":350370,"accn":"0000950123-10-074660","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-08-09","frame":"CY2010Q2I"},{"end":"2010-09-30","val":351039,"accn":"0000950123-10-097539","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-28","frame":"CY2010Q3I"},{"end":"2010-12-31","val":351174,"accn":"0000950123-11-019920","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"end":"2010-12-31","val":351174,"accn":"0000950123-11-048027","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-10"},{"end":"2010-12-31","val":351174,"accn":"0001193125-11-212185","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05"},{"end":"2010-12-31","val":351174,"accn":"0001193125-11-289088","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-01"},{"end":"2010-12-31","val":351000,"accn":"0001193125-12-084108","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28","frame":"CY2010Q4I"},{"end":"2011-03-31","val":356880,"accn":"0000950123-11-048027","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-10","frame":"CY2011Q1I"},{"end":"2011-06-30","val":357041,"accn":"0001193125-11-212185","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-05","frame":"CY2011Q2I"},{"end":"2011-09-30","val":357614,"accn":"0001193125-11-289088","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-01","frame":"CY2011Q3I"},{"end":"2011-12-31","val":358000,"accn":"0001193125-12-084108","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-28"},{"end":"2011-12-31","val":358000,"accn":"0001193125-12-217456","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08"},{"end":"2011-12-31","val":358000,"accn":"0001193125-12-331663","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-02"},{"end":"2011-12-31","val":358000,"accn":"0001193125-12-445841","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-01"},{"end":"2011-12-31","val":358000,"accn":"0001282977-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":364000,"accn":"0001193125-12-217456","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-08","frame":"CY2012Q1I"},{"end":"2012-06-30","val":364000,"accn":"0001193125-12-331663","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-02","frame":"CY2012Q2I"},{"end":"2012-09-30","val":365000,"accn":"0001193125-12-445841","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-01","frame":"CY2012Q3I"},{"end":"2012-12-31","val":365000,"accn":"0001282977-13-000007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":365000,"accn":"0001282977-13-000012","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-06"},{"end":"2012-12-31","val":365000,"accn":"0001282977-13-000015","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-01"},{"end":"2012-12-31","val":365000,"accn":"0001282977-13-000018","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-31"},{"end":"2012-12-31","val":365000,"accn":"0001282977-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27","frame":"CY2012Q4I"},{"end":"2013-03-31","val":370000,"accn":"0001282977-13-000012","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-06","frame":"CY2013Q1I"},{"end":"2013-06-30","val":377000,"accn":"0001282977-13-000015","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-01","frame":"CY2013Q2I"},{"end":"2013-09-30","val":378000,"accn":"0001282977-13-000018","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-31","frame":"CY2013Q3I"},{"end":"2013-12-31","val":379000,"accn":"0001282977-14-000005","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-27"},{"end":"2013-12-31","val":379000,"accn":"0001282977-14-000012","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-01"},{"end":"2013-12-31","val":379000,"accn":"0001282977-14-000014","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-05"},{"end":"2013-12-31","val":379000,"accn":"0001282977-14-000017","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04"},{"end":"2013-12-31","val":379000,"accn":"0001282977-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26","frame":"CY2013Q4I"},{"end":"2014-03-31","val":387000,"accn":"0001282977-14-000012","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-01","frame":"CY2014Q1I"},{"end":"2014-06-30","val":388000,"accn":"0001282977-14-000014","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-08-05","frame":"CY2014Q2I"},{"end":"2014-09-30","val":389000,"accn":"0001282977-14-000017","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-04","frame":"CY2014Q3I"},{"end":"2014-12-31","val":389000,"accn":"0001282977-15-000003","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-26"},{"end":"2014-12-31","val":389000,"accn":"0001282977-15-000007","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08"},{"end":"2014-12-31","val":389000,"accn":"0001282977-15-000012","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-05"},{"end":"2014-12-31","val":389000,"accn":"0001282977-15-000014","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-04"},{"end":"2014-12-31","val":389000,"accn":"0001282977-16-000016","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26","frame":"CY2014Q4I"},{"end":"2015-03-31","val":396000,"accn":"0001282977-15-000007","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08","frame":"CY2015Q1I"},{"end":"2015-06-30","val":404000,"accn":"0001282977-15-000012","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-05","frame":"CY2015Q2I"},{"end":"2015-09-30","val":405000,"accn":"0001282977-15-000014","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-04","frame":"CY2015Q3I"},{"end":"2015-12-31","val":405000,"accn":"0001282977-16-000016","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-26"},{"end":"2015-12-31","val":405000,"accn":"0001282977-16-000018","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-05"},{"end":"2015-12-31","val":405000,"accn":"0001282977-16-000020","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-08"},{"end":"2015-12-31","val":405000,"accn":"0001282977-16-000022","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-10-26"},{"end":"2015-12-31","val":405000,"accn":"0001282977-17-000002","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-28","frame":"CY2015Q4I"},{"end":"2016-03-31","val":413000,"accn":"0001282977-16-000018","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-05","frame":"CY2016Q1I"},{"end":"2016-06-30","val":413000,"accn":"0001282977-16-000020","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-08","frame":"CY2016Q2I"},{"end":"2016-09-30","val":414000,"accn":"0001282977-16-000022","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-10-26","frame":"CY2016Q3I"},{"end":"2016-12-31","val":414000,"accn":"0001282977-17-000002","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-28"},{"end":"2016-12-31","val":414000,"accn":"0001282977-17-000004","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08"},{"end":"2016-12-31","val":414000,"accn":"0001282977-17-000008","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09"},{"end":"2016-12-31","val":414000,"accn":"0001282977-17-000012","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09"},{"end":"2016-12-31","val":414000,"accn":"0001282977-18-000002","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28","frame":"CY2016Q4I"},{"end":"2017-03-31","val":424000,"accn":"0001282977-17-000004","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-08","frame":"CY2017Q1I"},{"end":"2017-06-30","val":424000,"accn":"0001282977-17-000008","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09","frame":"CY2017Q2I"},{"end":"2017-09-30","val":437000,"accn":"0001282977-17-000012","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":438000,"accn":"0001282977-18-000002","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-28"},{"end":"2017-12-31","val":438000,"accn":"0001282977-18-000006","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":438000,"accn":"0001282977-18-000008","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-08"},{"end":"2017-12-31","val":438000,"accn":"0001282977-18-000010","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-06"},{"end":"2017-12-31","val":438000,"accn":"0001282977-19-000005","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01","frame":"CY2017Q4I"},{"end":"2018-03-31","val":447000,"accn":"0001282977-18-000006","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":448000,"accn":"0001282977-18-000008","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-08","frame":"CY2018Q2I"},{"end":"2018-09-30","val":449000,"accn":"0001282977-18-000010","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-06","frame":"CY2018Q3I"},{"end":"2018-12-31","val":450000,"accn":"0001282977-19-000005","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01"},{"end":"2018-12-31","val":450000,"accn":"0001282977-19-000017","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10"},{"end":"2018-12-31","val":450000,"accn":"0001282977-19-000023","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-05"},{"end":"2018-12-31","val":450000,"accn":"0001282977-19-000028","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-07"},{"end":"2018-12-31","val":450000,"accn":"0001282977-20-000006","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-02","frame":"CY2018Q4I"},{"end":"2019-03-31","val":462000,"accn":"0001282977-19-000017","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2019Q1I"},{"end":"2019-06-30","val":467000,"accn":"0001282977-19-000023","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-05","frame":"CY2019Q2I"},{"end":"2019-09-30","val":468000,"accn":"0001282977-19-000028","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-07","frame":"CY2019Q3I"},{"end":"2019-12-31","val":468000,"accn":"0001282977-20-000006","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-02"},{"end":"2019-12-31","val":468000,"accn":"0001282977-20-000027","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-08"},{"end":"2019-12-31","val":468000,"accn":"0001282977-20-000034","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-07"},{"end":"2019-12-31","val":468000,"accn":"0001282977-20-000039","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-09"},{"end":"2019-12-31","val":468000,"accn":"0001282977-21-000010","fy":2020,"fp":"FY","form":"10-K","filed":"2021-02-26","frame":"CY2019Q4I"},{"end":"2020-03-31","val":483000,"accn":"0001282977-20-000027","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-08","frame":"CY2020Q1I"},{"end":"2020-06-30","val":485000,"accn":"0001282977-20-000034","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-07","frame":"CY2020Q2I"},{"end":"2020-09-30","val":486000,"accn":"0001282977-20-000039","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-09","frame":"CY2020Q3I"},{"end":"2020-12-31","val":487000,"accn":"0001282977-21-000010","fy":2020,"fp":"FY","form":"10-K","filed":"2021-02-26"},{"end":"2020-12-31","val":487000,"accn":"0001282977-21-000025","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-10"},{"end":"2020-12-31","val":487000,"accn":"0001282977-21-000031","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-09"},{"end":"2020-12-31","val":487000,"accn":"0001282977-21-000037","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-08"},{"end":"2020-12-31","val":487000,"accn":"0001282977-22-000005","fy":2021,"fp":"FY","form":"10-K","filed":"2022-02-28","frame":"CY2020Q4I"},{"end":"2021-03-31","val":502000,"accn":"0001282977-21-000025","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-10","frame":"CY2021Q1I"},{"end":"2021-06-30","val":505000,"accn":"0001282977-21-000031","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-09","frame":"CY2021Q2I"},{"end":"2021-09-30","val":506000,"accn":"0001282977-21-000037","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-08","frame":"CY2021Q3I"},{"end":"2021-12-31","val":506000,"accn":"0001282977-22-000005","fy":2021,"fp":"FY","form":"10-K","filed":"2022-02-28"},{"end":"2021-12-31","val":506000,"accn":"0001282977-22-000018","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-06"},{"end":"2021-12-31","val":506000,"accn":"0001282977-22-000036","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-08"},{"end":"2021-12-31","val":506000,"accn":"0001282977-22-000057","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-08"},{"end":"2021-12-31","val":506000,"accn":"0001282977-23-000012","fy":2022,"fp":"FY","form":"10-K","filed":"2023-02-28","frame":"CY2021Q4I"},{"end":"2022-03-31","val":519000,"accn":"0001282977-22-000018","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-06","frame":"CY2022Q1I"},{"end":"2022-06-30","val":524000,"accn":"0001282977-22-000036","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-08","frame":"CY2022Q2I"},{"end":"2022-09-30","val":525000,"accn":"0001282977-22-000057","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-08","frame":"CY2022Q3I"},{"end":"2022-12-31","val":533000,"accn":"0001282977-23-000012","fy":2022,"fp":"FY","form":"10-K","filed":"2023-02-28"},{"end":"2022-12-31","val":533000,"accn":"0001282977-23-000044","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-10"},{"end":"2022-12-31","val":533000,"accn":"0001282977-23-000048","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-09"},{"end":"2022-12-31","val":533000,"accn":"0001282977-23-000052","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-09","frame":"CY2022Q4I"},{"end":"2023-03-31","val":544000,"accn":"0001282977-23-000044","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-10","frame":"CY2023Q1I"},{"end":"2023-06-30","val":553000,"accn":"0001282977-23-000048","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-09","frame":"CY2023Q2I"},{"end":"2023-09-30","val":553000,"accn":"0001282977-23-000052","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-09","frame":"CY2023Q3I"}]}}