Commitments and Contingencies - Schedule of Principal Debt Repayments (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
2024 (remaining)	$ 317,887
2025	2,378,609
2026	5,184,971
2027	4,611,317
2028	537,754
Thereafter	1,901,155
Net book value	14,931,693
Total loan exposure including non-consolidated senior interests	770,200	$ 1,100,000
Loan participations sold, net, face amount	103,500	337,721
Secured debt, net
Debt Instrument [Line Items]
2024 (remaining)	312,388
2025	1,435,359
2026	3,884,695
2027	4,001,586
2028	529,496
Thereafter	849,034
Net book value	11,012,558	12,697,058
Long-term debt	11,001,491	12,683,095
Asset-specific debt, net
Debt Instrument [Line Items]
2024 (remaining)	0
2025	921,253
2026	0
2027	0
2028	0
Thereafter	279,984
Net book value	1,201,237	1,004,097
Long-term debt	1,197,056	1,000,210
Term Loans
Debt Instrument [Line Items]
2024 (remaining)	5,499
2025	21,997
2026	1,300,276
2027	8,258
2028	8,258
Thereafter	772,137
Net book value	$ 2,116,425	2,135,221
Amortization percentage	1.00%
Long-term debt	$ 2,089,715	2,101,632
Senior Secured Notes
Debt Instrument [Line Items]
2024 (remaining)	0
2025	0
2026	0
2027	335,316
2028	0
Thereafter	0
Net book value	335,316	366,090
Long-term debt	333,023	362,763
Convertible Notes
Debt Instrument [Line Items]
2024 (remaining)	0
2025	0
2026	0
2027	266,157
2028	0
Thereafter	0
Net book value	266,157	300,000
Long-term debt	263,334	295,847
Securitized debt obligations, net
Debt Instrument [Line Items]
Net book value	2,248,432	2,507,514
Long-term debt	$ 2,248,307	$ 2,505,417