Secured Debt, Net - Schedule of Secured Credit Facilities (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($) lender loan	Dec. 31, 2023 USD ($)
Schedule Of Secured Credit Facilities [Line Items]
Total secured debt	$ 14,931,693
Secured debt, net | Line of Credit
Schedule Of Secured Credit Facilities [Line Items]
Collateral	$ 709,000
Secured debt, net | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	14
Total secured debt	$ 11,012,558	$ 12,697,058
Loan Count | loan	134
Collateral	$ 16,451,583	$ 18,594,318
Secured debt, net | Weighted Average | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	34.00%
Secured debt, net | Minimum | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	25.00%
Secured debt, net | Maximum | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	100.00%
Secured debt, net | USD | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	13
Total secured debt	$ 5,700,943
Loan Count | loan	103
Collateral	$ 9,456,409
Secured debt, net | USD | Weighted Average | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	36.00%
Secured debt, net | USD | Minimum | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	25.00%
Secured debt, net | USD | Maximum | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	100.00%
Secured debt, net | GBP | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	6
Total secured debt	$ 2,290,098
Loan Count | loan	16
Collateral	$ 3,028,733
Secured debt, net | GBP | Weighted Average | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	26.00%
Secured debt, net | GBP | Minimum | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	25.00%
Secured debt, net | GBP | Maximum | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	50.00%
Secured debt, net | EUR | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	7
Total secured debt	$ 1,810,878
Loan Count | loan	11
Collateral	$ 2,453,143
Secured debt, net | EUR | Weighted Average | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	41.00%
Secured debt, net | EUR | Minimum | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	25.00%
Secured debt, net | EUR | Maximum | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	100.00%
Secured debt, net | Others | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	4
Total secured debt	$ 1,210,639
Loan Count | loan	4
Collateral	$ 1,513,298
Recourse Limitation	25.00%
Secured debt, net | Others | Weighted Average | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	25.00%