Loans Receivable, Net - Principal Balance and Net Book Value of Loans Receivable Based on Internal Risk Ratings (Detail) $ in Thousands	Dec. 31, 2022 USD ($) SecurityLoan	Dec. 31, 2021 USD ($) SecurityLoan	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | SecurityLoan	203	188
Net Book Value	$ 25,017,880	$ 22,003,017	$ 16,572,715
CECL reserve	(326,137)	(124,679)	$ (173,549)
Loans receivable, net	24,691,743	21,878,338
Total Loan Exposure	26,810,281	23,669,111
Total loan exposure including senior interests	$ 1,600,000	1,500,000
2018 Single Asset Securitization
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loan amount, securitized		$ 379,300
1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | SecurityLoan	17	8
Net Book Value	$ 1,403,185	$ 642,776
Total Loan Exposure	$ 1,428,232	$ 645,854
2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | SecurityLoan	36	28
Net Book Value	$ 5,880,424	$ 5,200,533
Total Loan Exposure	$ 6,562,852	$ 5,515,250
3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | SecurityLoan	134	141
Net Book Value	$ 14,128,133	$ 13,604,027
Total Loan Exposure	$ 15,209,018	$ 14,944,045
4
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | SecurityLoan	11	10
Net Book Value	$ 2,677,027	$ 2,270,872
Total Loan Exposure	$ 2,680,145	$ 2,277,653
5
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | SecurityLoan	5	1
Net Book Value	$ 929,111	$ 284,809
Total Loan Exposure	$ 930,034	$ 286,309