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Secured Debt Agreements, Net - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2019
Debt Instrument [Line Items]        
Aggregate borrowings $ 9,019,652,000 $ 1,971,860,000   $ 1,971,860,000
Interest expense 104,239,000   $ 118,688,000  
Covenants, minimum tangible net worth $ 2,800,000,000      
Covenants, percentage of tangible assets on cash proceeds from equity issuances 75.00%      
Covenants, percentage of recourse indebtedness 5.00%      
Joint Venture [Member]        
Debt Instrument [Line Items]        
Additional credit capacity $ 650,000,000.0      
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 1.40%      
Covenants, minimum cash liquidity amount $ 10,000,000.0      
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Weighted-average outstanding balance 0 0    
Interest expense 496,000,000,000 490,000,000,000    
Amortization of deferred fees and expenses 274,000,000,000 266,000,000,000    
Revolving Credit Facility [Member] | Barclays [Member]        
Debt Instrument [Line Items]        
Maximum Facility Size 250,000,000.0      
Credit Facilities [Member]        
Debt Instrument [Line Items]        
Weighted-average outstanding balance 9,300,000,000     9,400,000,000
Aggregate borrowings $ 9,019,652,000 9,753,059,000   $ 9,753,059,000
Basis spread on debt obligation, in percent       1.60%
Weighted-average advance rate 79.00%     79.40%
Weighted-average future funding period 3 years 6 months     3 years 7 months 6 days
Credit Facilities [Member] | Barclays [Member]        
Debt Instrument [Line Items]        
Aggregate borrowings $ 1,529,553,000 1,442,083,000   $ 1,442,083,000
Asset-Specific Financings [Member]        
Debt Instrument [Line Items]        
Weighted-average outstanding balance $ 342,100,000 $ 293,900,000    
LIBOR [Member] | Credit Facilities [Member] | Weighted-Average Cash Coupon [Member]        
Debt Instrument [Line Items]        
Basis spread on debt obligation, in percent 1.60%      
LIBOR [Member] | Credit Facilities [Member] | Weighted-Average All-in Cost of Credit [Member]        
Debt Instrument [Line Items]        
Basis spread on debt obligation, in percent 1.81%     1.79%