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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Apr. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Joint venture capital contribution percentage     85.00%
Income accrual, description Income accrual is generally suspended for loans at the earlier of the date at which payments become 90 days past due or when, in the opinion of our Manager, recovery of income and principal becomes doubtful.    
Cash and cash equivalents, description Cash and cash equivalents represent cash held in banks and liquid investments with original maturities of three months or less    
Borrower Escrows $ 391,100 $ 384,600  
Restricted cash 0 $ 0  
Impaired Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Increase in CECL reserve 69,700    
Level 3 [Member] | Fair Value, Nonrecurring [Member] | Impaired Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and lease receivable $ 338,700    
Level 3 [Member] | Minimum [Member] | Measurement Input, Cap Rate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Capitalisation rate of loans receivable 4.25%    
Level 3 [Member] | Maximum [Member] | Measurement Input, Cap Rate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Capitalisation rate of loans receivable 4.80%    
Walker and Dunlop [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Joint venture capital contribution percentage     15.00%