Secured Debt, Net - Schedule of Secured Credit Facilities (Detail) - Secured credit facilities - Line of Credit $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) loan lender	Dec. 31, 2023 USD ($)
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	15
Borrowings	$ 12,403,449	$ 12,697,058
Loan Count | loan	159
Collateral	$ 18,132,466	$ 18,594,318
Recourse Limitation Wtd. Avg. (percentage)	33.00%
Others
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	4
Borrowings	$ 1,571,844
Loan Count | loan	7
Collateral	$ 1,984,069
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	$ 6,465,606
Loan Count | loan	123
Collateral	$ 10,312,999
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	$ 2,340,817
Loan Count | loan	18
Collateral	$ 3,106,835
Recourse Limitation Wtd. Avg. (percentage)	26.00%
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	$ 2,025,182
Loan Count | loan	11
Collateral	$ 2,728,563
Recourse Limitation Wtd. Avg. (percentage)	40.00%
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%