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Loans Receivable, Net - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2020
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                    
Weighted-average risk rating on loan exposure   2.9       2.9   3.0    
Loans held   $ 18,528,773       $ 18,528,773   $ 17,454,621    
Net book value of restructured loan   17,307,898       17,307,898   16,399,166    
CECL reserve   128,945 $ 172,100 $ 178,050 $ 112,694 128,945 $ 178,050 173,549   $ 0
(Decrease) Increase in CECL reserve   (43,155) $ (1,449) 65,356 $ 98,752          
Reduction In Loan Spread And Extension In Maturity Date [Member]                    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                    
Financing receivable troubled debt restructuring premodification recorded investment $ 338,700                  
Financing receivable troubled debt restructuring premodification recorded investment income $ 0                  
CECL Troubled Debt Restructuring Principal Amount Due Is 52.4 Million Dollars [Member] | Reduction In Loan Spread And Extension In Maturity Date [Member]                    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                    
Increase in CECL reserve       14,800            
Financing receivable troubled debt restructuring premodification recorded investment           52,400        
CECL Troubled Debt Restructuring Principal Amount Due Is 54.9 Million Dollars [Member] | Reduction In Loan Spread And Extension In Maturity Date [Member]                    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                    
Increase in CECL reserve       54,900            
Financing receivable troubled debt restructuring premodification recorded investment           286,300        
COVID-19 pandemic [Member]                    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                    
Net book value of restructured loan   128,900   178,100   128,900 178,100      
CECL reserve                 $ 13,900  
(Decrease) Increase in CECL reserve   (43,200)   $ 65,400   (44,600) $ 164,100      
Multifamily [Member]                    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                    
Loans held   2,542,024       2,542,024   1,862,667    
Joint Venture [Member] | Multifamily [Member]                    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                    
Loans held   $ 520,500       $ 520,500   $ 484,800