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Other Assets and Liabilities - Summary of Unfunded Loan Commitment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance   $ 326,137 $ 124,679
Increase (decrease) in CECL reserve   250,799 201,458
Ending balance $ 576,936 576,936 326,137
U.S. loans      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance   67,880 26,885
Increase (decrease) in CECL reserve   10,455 40,995
Ending balance 78,335 78,335 67,880
Non-U.S. loans      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance   22,519 10,263
Increase (decrease) in CECL reserve   9,041 12,256
Ending balance 31,560 31,560 22,519
Unfunded Loan Commitment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance   16,380 6,263
Increase (decrease) in CECL reserve   (1,009) 10,117
Ending balance 15,371 15,371 16,380
Unfunded Loan Commitment | U.S. loans      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance   11,748 4,072
Increase (decrease) in CECL reserve   (693) 7,676
Ending balance 11,055 11,055 11,748
Unfunded Loan Commitment | Non-U.S. loans      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance   4,632 2,191
Increase (decrease) in CECL reserve   (316) 2,441
Ending balance 4,316 4,316 4,632
Unique loans      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance   45,960 32,657
Increase (decrease) in CECL reserve   3,411 13,303
Ending balance 49,371 49,371 45,960
Unique loans | Unfunded Loan Commitment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance   0 0
Increase (decrease) in CECL reserve   0 0
Ending balance 0 0 0
Impaired loans      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance   189,778 54,874
Increase (decrease) in CECL reserve 95,100 227,892 134,904
Ending balance 417,670 417,670 189,778
Impaired loans | Unfunded Loan Commitment      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Beginning balance   0 0
Increase (decrease) in CECL reserve   0 0
Ending balance $ 0 $ 0 $ 0