Secured Debt, Net - Schedule of Secured Credit Facilities (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($) lender loan	Dec. 31, 2023 USD ($)
Schedule Of Secured Credit Facilities [Line Items]
Total secured debt	$ 16,000,571
Secured debt, net | Line of Credit
Schedule Of Secured Credit Facilities [Line Items]
Collateral	$ 614,600
Secured debt, net | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Lenders | lender	15
Total secured debt	$ 12,110,576	$ 12,697,058
Loan Count | loan	153
Collateral	$ 17,958,345	$ 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	$ 6,175,087
Loan Count | loan	117
Collateral	$ 10,084,270
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	7
Total secured debt	$ 2,352,502
Loan Count | loan	18
Collateral	$ 3,128,584
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	$ 1,983,929
Loan Count | loan	11
Collateral	$ 2,726,991
Secured debt, net | EUR | Weighted Average | Line of Credit | Secured credit facilities
Schedule Of Secured Credit Facilities [Line Items]
Recourse Limitation	42.00%
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	$ 1,599,058
Loan Count | loan	7
Collateral	$ 2,018,500
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%