Secured Debt, Net - Schedule of Secured Credit Facilities (Detail) - Secured credit facilities - Line of Credit $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) lender	Dec. 31, 2021 USD ($)
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	14
Borrowings | $	$ 13,932,436	$ 12,299,580
Loan Count | lender	177
Collateral | $	$ 19,485,553	$ 17,042,381
Recourse Limitation Wtd. Avg. (percentage)	34.00%
Others
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	4
Borrowings | $	$ 1,653,232
Loan Count | lender	8
Collateral | $	$ 2,094,593
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 | $	$ 8,101,964
Loan Count | lender	142
Collateral | $	$ 11,873,368
Recourse Limitation Wtd. Avg. (percentage)	34.00%
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%
EUR
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	6
Borrowings | $	$ 2,119,463
Loan Count | lender	10
Collateral | $	$ 2,818,786
Recourse Limitation Wtd. Avg. (percentage)	45.00%
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%
GBP
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	6
Borrowings | $	$ 2,057,777
Loan Count | lender	18
Collateral | $	$ 2,698,806
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%