Loans Receivable, Net - Schedule Of Current Expected Credit Loss Reserve By Pool (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Loans Receivable, Net
CECL reserve	$ 178,050	$ 178,050	$ 112,694		$ 0
Increase in CECL reserve	65,356	164,108
U.S. Loans [Member]
Loans Receivable, Net
CECL reserve	61,404	61,404	64,861		0
Increase in CECL reserve	(3,457)	52,449
Non-U.S. Loans [Member]
Loans Receivable, Net
CECL reserve	19,745	19,745	21,825		0
Increase in CECL reserve	(2,080)	16,114
Unique Loans [Member]
Loans Receivable, Net
CECL reserve	27,240	27,240	26,008		0
Increase in CECL reserve	1,232	25,884
Impaired Loans [Member]
Loans Receivable, Net
CECL reserve	69,661	69,661	$ 0		$ 0
Increase in CECL reserve	$ 69,661	$ 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
Accounting Standards Update 2016-13 [Member] | Impaired Loans [Member]
Loans Receivable, Net
CECL reserve				$ 0