Secured Debt, Net - Schedule of Secured Credit Facilities (Detail) - Secured credit facilities - Line of Credit $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) lender	Dec. 31, 2021 USD ($)
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	15
Borrowings | $	$ 13,549,748	$ 12,299,580
Loan Count | lender	185
Collateral | $	$ 19,694,790	$ 17,042,381
Recourse Limitation Wtd. Avg. (percentage)	34.00%
Others
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	4
Borrowings | $	$ 1,602,788
Loan Count | lender	7
Collateral | $	$ 2,026,655
Recourse Limitation Wtd. Avg. (percentage)	25.00%
Recourse Limitation Range (percentage)	25.00%
Minimum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range (percentage)	25.00%
Maximum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range (percentage)	100.00%
USD
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	14
Borrowings | $	$ 7,497,992
Loan Count | lender	145
Collateral | $	$ 11,719,558
Recourse Limitation Wtd. Avg. (percentage)	36.00%
USD | Minimum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range (percentage)	25.00%
USD | Maximum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range (percentage)	100.00%
GBP
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	7
Borrowings | $	$ 2,320,720
Loan Count | lender	23
Collateral | $	$ 3,081,729
Recourse Limitation Wtd. Avg. (percentage)	27.00%
GBP | Minimum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range (percentage)	25.00%
GBP | Maximum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range (percentage)	50.00%
EUR
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	7
Borrowings | $	$ 2,128,248
Loan Count | lender	12
Collateral | $	$ 2,866,848
Recourse Limitation Wtd. Avg. (percentage)	42.00%
EUR | Minimum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range (percentage)	25.00%
EUR | Maximum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range (percentage)	100.00%