Secured Debt, Net - Schedule of Secured Credit Facilities (Detail) - Secured credit facilities - Line of Credit $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) lender	Dec. 31, 2022 USD ($)
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	15
Borrowings | $	$ 14,051,435	$ 13,549,748
Loan Count | lender	173
Collateral | $	$ 19,774,538	$ 19,694,790
Recourse Limitation Wtd. Avg. (percentage)	33.00%
Others
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	4
Borrowings | $	$ 1,654,888
Loan Count | lender	8
Collateral | $	$ 2,091,735
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 | $	$ 7,924,192
Loan Count | lender	132
Collateral | $	$ 11,686,034
Recourse Limitation Wtd. Avg. (percentage)	35.00%
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 | $	$ 2,413,082
Loan Count | lender	22
Collateral | $	$ 3,213,057
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 | $	$ 2,059,273
Loan Count | lender	11
Collateral | $	$ 2,783,712
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%