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Loans Receivable, Net - Additional Information (Detail)
$ in Thousands
3 Months Ended
Jul. 01, 2020
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
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   3.0     3.0    
Loans held   $ 18,033,021     $ 17,454,621    
Net book value of restructured loan   16,888,002     16,399,166    
CECL reserve   172,100   $ 112,694 173,549   $ 0
(Decrease) Increase in CECL reserve   (1,449)   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 52.8 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   172,100   112,700      
CECL reserve           $ 13,900  
(Decrease) Increase in CECL reserve   1,400   $ 98,800      
Multifamily [Member]              
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]              
Loans held   2,240,222     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   $ 587,700     $ 484,800