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Loans Receivable, Net - Additional Information (Detail)
12 Months Ended
Jul. 01, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
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 2.8  
Loans held   $ 17,454,621,000 $ 16,965,864,000  
Net book value of restructured loan   16,399,166,000 16,164,801,000 $ 14,191,200,000
Increase in CECL reserve   (173,549,000)    
CECL reserve   173,549,000 0  
(Decrease) Increase in CECL reserve   159,607,000    
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   338,700,000    
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   14,800,000    
Financing receivable troubled debt restructuring premodification recorded investment   52,400,000    
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   54,900,000    
Financing receivable troubled debt restructuring premodification recorded investment   286,300,000    
COVID-19 pandemic [Member]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Loans held   3,200,000,000    
Net book value of restructured loan   173,500,000    
CECL reserve   13,900,000    
(Decrease) Increase in CECL reserve   $ 159,600,000    
COVID-19 pandemic [Member] | Risk One [Member]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Weighted-average risk rating on loan exposure   4    
COVID-19 pandemic [Member] | Risk Two [Member]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Weighted-average risk rating on loan exposure   5    
Multifamily [Member]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Loans held   $ 1,862,667,000 1,642,664,000  
Joint Venture [Member] | Multifamily [Member]        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]        
Loans held   $ 484,800,000 $ 670,500,000