{"cik":1023313,"taxonomy":"us-gaap","tag":"LongTermDebt","label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","entityName":"FORRESTER RESEARCH, INC.","units":{"USD":[{"end":"2019-03-31","val":150759000,"accn":"0001564590-19-018519","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2019Q1I"},{"end":"2019-06-30","val":139353000,"accn":"0001564590-19-029316","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-06","frame":"CY2019Q2I"},{"end":"2019-09-30","val":131949000,"accn":"0001564590-19-042244","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-11-08","frame":"CY2019Q3I"},{"end":"2019-12-31","val":130545000,"accn":"0001564590-20-010647","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-13"},{"end":"2019-12-31","val":130545000,"accn":"0001564590-20-023888","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-11"},{"end":"2019-12-31","val":130545000,"accn":"0001564590-20-038910","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-10"},{"end":"2019-12-31","val":130545000,"accn":"0001564590-20-051948","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-06"},{"end":"2019-12-31","val":130545000,"accn":"0001564590-21-012256","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-11","frame":"CY2019Q4I"},{"end":"2020-03-31","val":114358000,"accn":"0001564590-20-023888","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-05-11","frame":"CY2020Q1I"},{"end":"2020-06-30","val":112173000,"accn":"0001564590-20-038910","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-10","frame":"CY2020Q2I"},{"end":"2020-09-30","val":109987000,"accn":"0001564590-20-051948","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-06","frame":"CY2020Q3I"},{"end":"2020-12-31","val":107799000,"accn":"0001564590-21-012256","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-11"},{"end":"2020-12-31","val":107799000,"accn":"0001564590-21-024560","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-06"},{"end":"2020-12-31","val":107799000,"accn":"0000950170-21-000983","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-06"},{"end":"2020-12-31","val":107799000,"accn":"0000950170-21-003163","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-05"},{"end":"2020-12-31","val":107799000,"accn":"0000950170-22-003377","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-10","frame":"CY2020Q4I"},{"end":"2021-03-31","val":104819000,"accn":"0001564590-21-024560","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-06","frame":"CY2021Q1I"},{"end":"2021-06-30","val":101842000,"accn":"0000950170-21-000983","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-06","frame":"CY2021Q2I"},{"end":"2021-09-30","val":98864000,"accn":"0000950170-21-003163","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-05","frame":"CY2021Q3I"},{"end":"2021-12-31","val":75000000,"accn":"0000950170-22-003377","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-10","frame":"CY2021Q4I"}]}}