Commitments and Contingencies - Schedule of Principal Debt Repayments (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
2023 (remaining)	$ 139,400
2024	2,790,960
2025	2,114,802
2026	5,563,566
2027	3,939,887
Thereafter	2,004,043
Net book value	$ 16,552,658
Amortization percentage	1.00%
Securitized debt obligations excluded from contractual obligations	$ 2,500,000
Nonconsolidated securitized debt excluded from contractual obligations	1,100,000
Net loan exposure, loan participations sold	275,700
Loan participations sold, net, Face Amount	275,697	$ 224,744
Secured Debt
Debt Instrument [Line Items]
2023 (remaining)	133,901
2024	2,768,963
2025	1,306,172
2026	4,260,992
2027	3,265,039
Thereafter	1,074,846
Net book value	12,809,913
Asset-Specific Debt
Debt Instrument [Line Items]
2023 (remaining)	0
2024	0
2025	786,633
2026	0
2027	0
Thereafter	148,802
Net book value	935,435
Term Loans
Debt Instrument [Line Items]
2023 (remaining)	5,499
2024	21,997
2025	21,997
2026	1,302,574
2027	8,258
Thereafter	780,395
Net book value	2,140,720
Senior Secured Notes
Debt Instrument [Line Items]
2023 (remaining)	0
2024	0
2025	0
2026	0
2027	366,590
Thereafter	0
Net book value	366,590
Convertible Notes
Debt Instrument [Line Items]
2023 (remaining)	0
2024	0
2025	0
2026	0
2027	300,000
Thereafter	0
Net book value	$ 300,000