Investments - Summary of Selected Financial Information for JCP Fund V (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended			12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019
Schedule of Equity Method Investments [Line Items]
Total assets							$ 54,768,900	$ 47,751,997
Liabilities							47,690,292	41,385,865
JCP Fund V
Schedule of Equity Method Investments [Line Items]
Net gains (losses) from our investments in JCP Fund V							$ 7,700	$ (3,000)	$ (5,700)
Total assets				$ 72,184	$ 49,404
Liabilities				80	84
Total partners’ capital				72,104	49,319
Net increase (decrease) in net assets resulting from operations	$ (1,024)	$ (1,397)	$ (8,412)	$ 23,809	$ (12,456)	$ (19,070)