Loans Receivable, Net - Loans Receivable Based On Our Internal Risk Ratings, Separated By Year Of Origination (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 23,708,990	$ 22,003,017
CECL reserve	(122,221)	(124,679)	$ (172,100)	$ (173,549)
Loans receivable, net	23,586,769	21,878,338
Held-to-maturity debt securities	0	78,013
U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	1,631,803	8,514,292
Year Two	8,456,042	786,287
Year Three	784,338	1,623,239
Year Four	1,619,419	2,858,738
Year Five	2,851,665	958,787
Prior	937,598	399,977
Loans receivable	16,280,865	15,141,320
Non-U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	754,810	2,101,240
Year Two	2,165,298	98,412
Year Three	97,912	2,582,847
Year Four	2,540,334	394,949
Year Five	275,192	0
Prior	0	0
Loans receivable	5,833,546	5,177,448
Unique Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	322,787
Year Four	313,633	1,017,799
Year Five	939,104	0
Prior	57,033	58,854
Loans receivable	1,309,770	1,399,440
CECL reserve	(30,897)	(32,657)	(33,305)	(33,159)
Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	284,809
Year Five	284,809	0
Prior	0	0
Loans receivable	284,809	284,809
CECL reserve	(54,874)	(54,874)	$ (69,661)	$ (69,661)
Total loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	2,386,613	10,615,532
Year Two	10,621,340	884,699
Year Three	882,250	4,528,873
Year Four	4,473,386	4,556,295
Year Five	4,350,770	958,787
Prior	994,631	458,831
Loans receivable	23,708,990	22,003,017
1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	426,984	642,776
1 | U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	125,873
Year Two	126,675	0
Year Three	0	196,017
Year Four	255,374	72,752
Year Five	0	248,134
Prior	44,935	0
Loans receivable	426,984	642,776
1 | Non-U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Loans receivable	0	0
1 | Unique Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Loans receivable	0	0
1 | Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Loans receivable	0	0
1 | Total loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	125,873
Year Two	126,675	0
Year Three	0	196,017
Year Four	255,374	72,752
Year Five	0	248,134
Prior	44,935	0
Loans receivable	426,984	642,776
2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	5,982,543	5,200,533
2 | U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	108,484	876,536
Year Two	1,556,681	427,839
Year Three	522,982	221,513
Year Four	318,298	1,134,176
Year Five	1,203,257	354,775
Prior	222,119	82,274
Loans receivable	3,931,821	3,097,113
2 | Non-U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	698,130
Year Two	672,049	98,412
Year Three	97,912	1,306,878
Year Four	1,280,761	0
Year Five	0	0
Prior	0	0
Loans receivable	2,050,722	2,103,420
2 | Unique Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Loans receivable	0	0
2 | Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Loans receivable	0	0
2 | Total loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	108,484	1,574,666
Year Two	2,228,730	526,251
Year Three	620,894	1,528,391
Year Four	1,599,059	1,134,176
Year Five	1,203,257	354,775
Prior	222,119	82,274
Loans receivable	5,982,543	5,200,533
3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	14,827,128	13,604,027
3 | U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	1,523,319	7,511,883
Year Two	6,772,686	358,448
Year Three	261,356	1,109,170
Year Four	949,205	1,116,872
Year Five	1,106,959	292,520
Prior	520,228	228,264
Loans receivable	11,133,753	10,617,157
3 | Non-U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	754,810	1,403,110
Year Two	1,493,249	0
Year Three	0	932,939
Year Four	921,706	394,949
Year Five	275,192	0
Prior	0	0
Loans receivable	3,444,957	2,730,998
3 | Unique Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	197,018
Year Five	191,385	0
Prior	57,033	58,854
Loans receivable	248,418	255,872
3 | Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Loans receivable	0	0
3 | Total loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	2,278,129	8,914,993
Year Two	8,265,935	358,448
Year Three	261,356	2,042,109
Year Four	1,870,911	1,708,839
Year Five	1,573,536	292,520
Prior	577,261	287,118
Loans receivable	14,827,128	13,604,027
4
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,187,526	2,270,872
4 | U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	96,539
Year Four	96,542	534,938
Year Five	541,449	63,358
Prior	150,316	89,439
Loans receivable	788,307	784,274
4 | Non-U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	343,030
Year Four	337,867	0
Year Five	0	0
Prior	0	0
Loans receivable	337,867	343,030
4 | Unique Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	322,787
Year Four	313,633	820,781
Year Five	747,719	0
Prior	0	0
Loans receivable	1,061,352	1,143,568
4 | Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Loans receivable	0	0
4 | Total loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	762,356
Year Four	748,042	1,355,719
Year Five	1,289,168	63,358
Prior	150,316	89,439
Loans receivable	2,187,526	2,270,872
5 | U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Loans receivable	0	0
5 | Non-U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Loans receivable	0	0
5 | Unique Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	0
Year Five	0	0
Prior	0	0
Loans receivable	0	0
5 | Impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	284,809
Year Five	284,809	0
Prior	0	0
Loans receivable	284,809	284,809
5 | Total loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0	0
Year Two	0	0
Year Three	0	0
Year Four	0	284,809
Year Five	284,809	0
Prior	0	0
Loans receivable	$ 284,809	$ 284,809