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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
USD ($)
credit_facility
loan
Jan. 01, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Joint venture capital contribution percentage           85.00%
Restricted cash   $ 0   $ 0    
Borrower escrows   459,600   531,200    
CECL reserve   $ 326,137   124,679 $ 173,549  
Number of loans accounted for under cost-recovery method, floating rate | loan   5        
Principal balance   $ 25,017,880   22,003,017 $ 16,572,715  
Decrease to additional paid-in capital   (5,475,804)   (5,373,029)    
Decrease to accumulated deficit   $ (968,749)   $ (794,832)    
Credit Spread Option | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of loans | loan   76        
Number of credit facilities | credit_facility   12        
Average compounded SOFR (percentage)   4.36%        
Credit Spread Option | United State Dollar LIBOR Rate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Average compounded SOFR (percentage)   4.39%        
Credit Spread Option | Sterling Overnight Index Average ("SONIA")            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Aggregate Loan Principal Balance, Transitioned To Applicable Replacement Benchmark   63.50%        
Credit Spread Option | Sterling Overnight Index Average ("SONIA") | Forecast            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Aggregate Loan Principal Balance, Transitioned To Applicable Replacement Benchmark 36.50%          
Level 3 | Measurement Input, Cap Rate | Minimum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measurement input (percentage)   0.0500        
Level 3 | Measurement Input, Cap Rate | Maximum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measurement input (percentage)   0.0750        
Level 3 | Measurement Input, Discount Rate | Minimum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measurement input (percentage)   0.0750        
Level 3 | Measurement Input, Discount Rate | Maximum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Measurement input (percentage)   0.0900        
Level 3 | Fair Value, Nonrecurring            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
CECL reserve   $ 189,800        
Number of loans accounted for under cost-recovery method, floating rate | loan   5        
Principal balance   $ 930,000        
Accounting Standards Update 2020-06 | Cumulative Effect, Period of Adoption, Adjustment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Decrease to additional paid-in capital     $ 2,400      
Decrease to accumulated deficit     2,000      
Increase to convertible notes, net     $ 477      
Walker and Dunlop            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Joint venture capital contribution percentage           15.00%