Secured Debt, Net - Schedule of Secured Credit Facilities (Detail) - Secured credit facilities - Line of Credit $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) lender	Dec. 31, 2020 USD ($)
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	12
Borrowings | $	$ 12,299,580	$ 7,896,863
Loan Count | lender	159
Collateral | $	$ 17,042,381	$ 12,040,907
Recourse Limitation Wtd. Avg.	35.00%
Others
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	4
Borrowings | $	$ 888,118
Loan Count | lender	6
Collateral | $	$ 1,150,976
Recourse Limitation Wtd. Avg.	26.00%
Minimum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range	25.00%
Minimum | Others
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range	25.00%
Maximum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range	100.00%
Maximum | Others
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range	100.00%
USD
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	13
Borrowings | $	$ 7,334,420
Loan Count | lender	128
Collateral | $	$ 10,420,015
Recourse Limitation Wtd. Avg.	34.00%
USD | Minimum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range	25.00%
USD | Maximum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range	100.00%
EUR
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	6
Borrowings | $	$ 2,333,523
Loan Count | lender	10
Collateral | $	$ 3,148,250
Recourse Limitation Wtd. Avg.	47.00%
EUR | Minimum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range	25.00%
EUR | Maximum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range	100.00%
GBP
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	6
Borrowings | $	$ 1,743,519
Loan Count | lender	15
Collateral | $	$ 2,323,140
Recourse Limitation Wtd. Avg.	26.00%
GBP | Minimum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range	25.00%
GBP | Maximum
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation Range	50.00%