Loans Receivable, Net - Loans Receivable Based On Our Internal Risk Ratings, Separated By Year Of Origination (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 24,423,133			$ 22,003,017
CECL reserve	(144,431)	$ (133,024)	$ (122,221)	(124,679)	$ (130,388)	$ (128,945)	$ (172,100)	$ (173,549)
Loans receivable, net	24,278,702			21,878,338
Held-to-maturity debt securities	0			78,013
US Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	2,222,000			8,514,292
Year Two	8,240,551			786,287
Year Three	768,352			1,623,239
Year Four	1,401,721			2,858,738
Year Five	3,126,440			958,787
Prior	648,668			399,977
Loans receivable	16,407,732			15,141,320
Non-U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	1,289,463			2,101,240
Year Two	1,993,707			98,412
Year Three	86,895			2,582,847
Year Four	2,133,110			394,949
Year Five	135,024			0
Prior	0			0
Loans receivable	5,638,199			5,177,448
Unique Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	1,046,656			0
Year Two	0			0
Year Three	0			322,787
Year Four	267,077			1,017,799
Year Five	778,660			0
Prior	0			58,854
Loans receivable	2,092,393			1,399,440
CECL reserve	(36,577)	(33,495)	(30,897)	(32,657)	(31,255)	(32,782)	(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)	$ (54,874)	(54,874)	$ (69,661)	$ (69,661)	$ (69,661)	$ (69,661)
Total loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	4,558,119			10,615,532
Year Two	10,234,258			884,699
Year Three	855,247			4,528,873
Year Four	3,801,908			4,556,295
Year Five	4,324,933			958,787
Prior	648,668			458,831
Loans receivable	24,423,133			22,003,017
1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,059,274			642,776
1 | US Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	126,002			125,873
Year Two	312,208			0
Year Three	4,716			196,017
Year Four	200,910			72,752
Year Five	415,438			248,134
Prior	0			0
Loans receivable	1,059,274			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	126,002			125,873
Year Two	312,208			0
Year Three	4,716			196,017
Year Four	200,910			72,752
Year Five	415,438			248,134
Prior	0			0
Loans receivable	1,059,274			642,776
2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	6,323,262			5,200,533
2 | US Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	117,240			876,536
Year Two	1,985,821			427,839
Year Three	489,744			221,513
Year Four	152,102			1,134,176
Year Five	1,068,623			354,775
Prior	0			82,274
Loans receivable	3,813,530			3,097,113
2 | Non-U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	533,332			698,130
Year Two	570,497			98,412
Year Three	86,895			1,306,878
Year Four	1,110,962			0
Year Five	0			0
Prior	0			0
Loans receivable	2,301,686			2,103,420
2 | Unique Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	208,046			0
Year Two	0			0
Year Three	0			0
Year Four	0			0
Year Five	0			0
Prior	0			0
Loans receivable	208,046			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	858,618			1,574,666
Year Two	2,556,318			526,251
Year Three	576,639			1,528,391
Year Four	1,263,064			1,134,176
Year Five	1,068,623			354,775
Prior	0			82,274
Loans receivable	6,323,262			5,200,533
3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	14,070,849			13,604,027
3 | US Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	1,978,758			7,511,883
Year Two	5,733,693			358,448
Year Three	273,892			1,109,170
Year Four	952,167			1,116,872
Year Five	823,215			292,520
Prior	283,414			228,264
Loans receivable	10,045,139			10,617,157
3 | Non-U.S. Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	756,131			1,403,110
Year Two	1,423,210			0
Year Three	0			932,939
Year Four	709,834			394,949
Year Five	135,024			0
Prior	0			0
Loans receivable	3,024,199			2,730,998
3 | Unique Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	838,610			0
Year Two	0			0
Year Three	0			0
Year Four	0			197,018
Year Five	162,901			0
Prior	0			58,854
Loans receivable	1,001,511			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	3,573,499			8,914,993
Year Two	7,156,903			358,448
Year Three	273,892			2,042,109
Year Four	1,662,001			1,708,839
Year Five	1,121,140			292,520
Prior	283,414			287,118
Loans receivable	14,070,849			13,604,027
4
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	2,684,939			2,270,872
4 | US Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year One	0			0
Year Two	208,829			0
Year Three	0			96,539
Year Four	96,542			534,938
Year Five	819,164			63,358
Prior	365,254			89,439
Loans receivable	1,489,789			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	312,314			0
Year Five	0			0
Prior	0			0
Loans receivable	312,314			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	267,077			820,781
Year Five	615,759			0
Prior	0			0
Loans receivable	882,836			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	208,829			0
Year Three	0			762,356
Year Four	675,933			1,355,719
Year Five	1,434,923			63,358
Prior	365,254			89,439
Loans receivable	2,684,939			2,270,872
5 | US 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