Loans Receivable, Net - Schedule Of Current Expected Credit Loss Reserve By Pool (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Loans Receivable, Net
CECL reserve	$ 128,945	$ 172,100	$ 178,050	$ 112,694	$ 173,549		$ 0
Increase (decrease) in CECL reserve	(43,155)	(1,449)	65,356	98,752
U.S. Loans [Member]
Loans Receivable, Net
CECL reserve	17,673	44,534	61,404	64,861	42,995
Increase (decrease) in CECL reserve	(26,861)	1,539	(3,457)	55,906
Non-U.S. Loans [Member]
Loans Receivable, Net
CECL reserve	8,829	24,600	19,745	21,825	27,734
Increase (decrease) in CECL reserve	(15,771)	(3,134)	(2,080)	18,194
Unique Loans [Member]
Loans Receivable, Net
CECL reserve	32,782	33,305	27,240	26,008	33,159		0
Increase (decrease) in CECL reserve	(523)	146	1,232	$ 24,652
Impaired Loans [Member]
Loans Receivable, Net
CECL reserve	$ 69,661	$ 69,661	69,661		$ 69,661		$ 0
Increase (decrease) in CECL reserve			$ 69,661
Accounting Standards Update 2016-13 [Member]
Loans Receivable, Net
CECL reserve						$ 13,942
Accounting Standards Update 2016-13 [Member] | U.S. Loans [Member]
Loans Receivable, Net
CECL reserve						8,955
Accounting Standards Update 2016-13 [Member] | Non-U.S. Loans [Member]
Loans Receivable, Net
CECL reserve						3,631
Accounting Standards Update 2016-13 [Member] | Unique Loans [Member]
Loans Receivable, Net
CECL reserve						$ 1,356