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Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":21032000,"accn":"0001140361-13-014459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":5720000,"accn":"0001140361-14-014783","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":1857000,"accn":"0001140361-15-013560","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsReceivableDueThereafter":{"label":"Capital Leases, Future Minimum Payments, Receivable Thereafter","description":"Amount of minimum lease payments to be received by the lessor for capital leases after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":108000,"accn":"0001140361-13-014459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":17000,"accn":"0001140361-14-014783","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":2000,"accn":"0001140361-15-013560","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsReceivableInFiveYears":{"label":"Capital Leases, Future Minimum Payments, Receivable in Five Years","description":"Amount of minimum lease payments to be received by the lessor for capital leases in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":359000,"accn":"0001140361-13-014459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":67000,"accn":"0001140361-14-014783","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":5000,"accn":"0001140361-15-013560","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsReceivableInFourYears":{"label":"Capital Leases, Future Minimum Payments, Receivable in Four Years","description":"Amount of minimum lease payments to be received by the lessor for capital leases in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":1166000,"accn":"0001140361-13-014459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":342000,"accn":"0001140361-14-014783","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":92000,"accn":"0001140361-15-013560","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsReceivableInThreeYears":{"label":"Capital Leases, Future Minimum Payments, Receivable in Three Years","description":"Amount of minimum lease payments to be received by the lessor for capital leases in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":2652000,"accn":"0001140361-13-014459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":931000,"accn":"0001140361-14-014783","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":306000,"accn":"0001140361-15-013560","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"CapitalLeasesFutureMinimumPaymentsReceivableInTwoYears":{"label":"Capital Leases, Future Minimum Payments, Receivable in Two Years","description":"Amount of minimum lease payments to be received by the lessor for capital leases in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2012-12-31","val":8297000,"accn":"0001140361-13-014459","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"},{"end":"2013-12-31","val":2278000,"accn":"0001140361-14-014783","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-31","frame":"CY2013Q4I"},{"end":"2014-12-31","val":564000,"accn":"0001140361-15-013560","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q4I"}]}},"CapitalLeasesNetInvestmentInDirectFinancingLeases":{"label":"Capital Leases, Net Investment in Direct Financing Leases","description":"The net investment in direct financing leases as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.","units":{"USD":[{"end":"2010-12-31","val":187892000,"accn":"0001140361-11-040475","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09"},{"end":"2010-12-31","val":187892000,"accn":"0001140361-11-053490","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14"},{"end":"2010-12-31","val":187892000,"accn":"0001140361-12-017829","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-28","frame":"CY2010Q4I"},{"end":"2011-06-30","val":129839000,"accn":"0001140361-11-040475","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-09","frame":"CY2011Q2I"},{"end":"2011-09-30","val":106796000,"accn":"0001140361-11-053490","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-14","frame":"CY2011Q3I"},{"end":"2011-12-31","val":84367000,"accn":"0001140361-12-017829","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-28"},{"end":"2011-12-31","val":84367000,"accn":"0001140361-12-025278","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2011Q4I"},{"end":"2012-03-31","val":67134000,"accn":"0001140361-12-025278","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-15","frame":"CY2012Q1I"},{"end":"2014-06-30","val":260000,"accn":"0001140361-15-013560","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2014Q2I"}]}},"Cash":{"label":"Cash","description":"Amount of currency on hand as well as demand deposits with banks or financial institutions. 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