Secured Debt, Net - Schedule of Secured Credit Facilities (Detail) - Secured credit facilities - Line of Credit $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($) lender	Dec. 31, 2022 USD ($)
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	15
Borrowings | $	$ 13,451,427	$ 13,549,748
Loan Count | lender	178
Collateral | $	$ 19,350,114	$ 19,694,790
Recourse Limitation Wtd. Avg. (percentage)	34.00%
Others
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	4
Borrowings | $	$ 1,601,966
Loan Count | lender	7
Collateral | $	$ 2,022,823
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 | $	$ 7,269,836
Loan Count | lender	138
Collateral | $	$ 11,207,372
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 | $	$ 2,486,823
Loan Count | lender	22
Collateral | $	$ 3,306,552
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 | $	$ 2,092,802
Loan Count | lender	11
Collateral | $	$ 2,813,367
Recourse Limitation Wtd. Avg. (percentage)	41.00%
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%