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Secured Debt Agreements, Net - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Debt Instrument [Line Items]      
Interest expense $ 118,688,000 $ 69,989,000  
Covenants, minimum tangible net worth $ 2,600,000,000    
Covenants, percentage of tangible assets on cash proceeds from equity issuances 75.00%    
Covenants, percentage of recourse indebtedness 5.00%    
Maximum [Member]      
Debt Instrument [Line Items]      
Covenants, indebtedness to total assets, in percent 83.33%    
Minimum [Member]      
Debt Instrument [Line Items]      
Covenants, EBITDA to fixed charges, in percent 140.00%    
Covenants, minimum cash liquidity amount $ 10,000,000    
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Weighted-average outstanding balance 43,800,000   $ 63,500,000
Secured debt agreements borrowings outstanding 43,800,000   43,800,000
Interest expense 969,000   1,200,000
Amortization of deferred fees and expenses 268,000   297,000
Revolving Credit Facility [Member] | Barclays [Member]      
Debt Instrument [Line Items]      
Maximum Facility Size $ 250,000,000    
First mortgage bridge to term financing maximum period 6 months    
Credit Facilities [Member]      
Debt Instrument [Line Items]      
Weighted-average outstanding balance $ 9,100,000,000   7,700,000,000
Aggregate borrowings $ 9,093,821,000   $ 8,870,897,000
Basis spread on debt obligation, in percent 1.72%    
Weighted-average advance rate 79.50%   79.50%
Weighted-average initial maturity 3 years 2 months 12 days   3 years 6 months
Credit Facilities [Member] | Barclays [Member]      
Debt Instrument [Line Items]      
Aggregate borrowings $ 890,620,000   $ 890,620,000
Asset-Specific Financings [Member]      
Debt Instrument [Line Items]      
Weighted-average outstanding balance $ 88,900,000,000   68,000,000,000
Secured debt agreements borrowings outstanding     936,300,000
Asset-Specific Financings [Member] | Senior Loan [Member]      
Debt Instrument [Line Items]      
Secured loan     $ 1,100,000,000
LIBOR [Member] | Credit Facilities [Member] | Weighted-Average Cash Coupon [Member]      
Debt Instrument [Line Items]      
Basis spread on debt obligation, in percent     1.72%
LIBOR [Member] | Credit Facilities [Member] | Weighted-Average All-in Cost of Credit [Member]      
Debt Instrument [Line Items]      
Basis spread on debt obligation, in percent 1.90%   1.90%