Loans Receivable, Net - Schedule Of Current Expected Credit Loss Reserve By Pool (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Loans Receivable, Net
CECL reserve	$ 173,549		$ 0
Increase in CECL reserve	159,607
U.S. Loans [Member]
Loans Receivable, Net
CECL reserve	42,995		0
Increase in CECL reserve	34,040
Non-U.S. Loans [Member]
Loans Receivable, Net
CECL reserve	27,734		0
Increase in CECL reserve	24,103
Unique Loans [Member]
Loans Receivable, Net
CECL reserve	33,159		0
Increase in CECL reserve	31,803
Impaired Loans [Member]
Loans Receivable, Net
CECL reserve	69,661		$ 0
Increase 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
Accounting Standards Update 2016-13 [Member] | Impaired Loans [Member]
Loans Receivable, Net
CECL reserve		$ 0