Commitments and Contingencies - Schedule of Principal Debt Repayments (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
2023 (remaining)	$ 229,765
2024	3,021,515
2025	2,196,381
2026	5,707,048
2027	4,012,552
Thereafter	2,006,002
Net book value	$ 17,173,263
Amortization percentage	1.00%
Securitized debt obligations excluded from contractual obligations	$ 2,700,000
Nonconsolidated securitized debt excluded from contractual obligations	1,200,000
Net loan exposure, loan participations sold	236,300	$ 224,700
Loan participations sold, net, Face Amount	236,276	$ 224,744
Secured Debt
Debt Instrument [Line Items]
2023 (remaining)	218,767
2024	2,999,518
2025	1,433,177
2026	4,404,473
2027	3,304,294
Thereafter	1,091,198
Net book value	13,451,427
Asset-Specific Debt
Debt Instrument [Line Items]
2023 (remaining)	0
2024	0
2025	741,207
2026	0
2027	0
Thereafter	134,409
Net book value	875,616
Term Loans
Debt Instrument [Line Items]
2023 (remaining)	10,998
2024	21,997
2025	21,997
2026	1,302,575
2027	8,258
Thereafter	780,395
Net book value	2,146,220
Senior Secured Notes
Debt Instrument [Line Items]
2023 (remaining)	0
2024	0
2025	0
2026	0
2027	400,000
Thereafter	0
Net book value	400,000
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