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Secured Debt Agreements, Net - Summary of Key Terms of Credit Facilities (Detail)
€ in Thousands, £ in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2017
GBP (£)
Sep. 30, 2017
EUR (€)
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 4,386,645      
Potential Borrowings $ 4,989,350      
Rate 1.88%      
Advance Rate 78.80%      
Credit Facilities [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 4,386,645 $ 3,572,837    
Potential Borrowings $ 4,989,350 $ 4,114,580    
Advance Rate 78.80% 79.10%    
Credit Facilities [Member] | 1-Month USD LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 4,123,064      
Potential Borrowings $ 4,610,777      
Rate 1.86%      
Advance Rate 78.80%      
Credit Facilities [Member] | 3-Month EURIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings | €       € 66,186
Potential Borrowings | €       € 87,786
Rate 2.24%      
Advance Rate 80.00%      
Credit Facilities [Member] | 3-Month GBP LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings | £     £ 138,371  
Potential Borrowings | £     £ 205,152  
Rate 2.24%      
Advance Rate 78.60%      
Credit Facilities [Member] | Wells Fargo [Member]        
Line of Credit Facility [Line Items]        
Guarantee 25.00%      
Margin Call Collateral marks only      
Term/Maturity Term matched      
Outstanding Borrowings $ 1,398,224 $ 1,107,733    
Potential Borrowings $ 1,724,227 1,339,942    
Credit Facilities [Member] | MetLife [Member]        
Line of Credit Facility [Line Items]        
Guarantee 50.00%      
Margin Call Collateral marks only      
Term/Maturity Apr. 21, 2023      
Outstanding Borrowings $ 807,164 862,454    
Potential Borrowings $ 807,164 862,454    
Credit Facilities [Member] | Bank of America [Member]        
Line of Credit Facility [Line Items]        
Guarantee 50.00%      
Margin Call Collateral marks only      
Term/Maturity May 21, 2021      
Outstanding Borrowings $ 641,066 617,694    
Potential Borrowings $ 641,066 617,694    
Credit Facilities [Member] | Societe Generale [Member]        
Line of Credit Facility [Line Items]        
Guarantee 25.00%      
Margin Call Collateral marks only      
Term/Maturity Term matched      
Outstanding Borrowings $ 266,000 207,178    
Potential Borrowings $ 266,000 207,178    
Credit Facilities [Member] | Deutsche Bank [Member]        
Line of Credit Facility [Line Items]        
Guarantee 35.00%      
Margin Call Collateral marks only      
Term/Maturity Term matched      
Outstanding Borrowings $ 295,743      
Potential Borrowings $ 295,743      
Credit Facilities [Member] | Citibank [Member]        
Line of Credit Facility [Line Items]        
Guarantee 25.00%      
Margin Call Collateral marks only      
Term/Maturity Term matched      
Outstanding Borrowings $ 356,751 229,629    
Potential Borrowings $ 464,849 394,677    
Credit Facilities [Member] | Morgan Stanley [Member]        
Line of Credit Facility [Line Items]        
Guarantee 25.00%      
Margin Call Collateral marks only      
Term/Maturity Mar. 03, 2020      
Outstanding Borrowings $ 211,105 231,930    
Potential Borrowings $ 331,037 272,221    
Credit Facilities [Member] | JP Morgan [Member]        
Line of Credit Facility [Line Items]        
Guarantee 50.00%      
Margin Call Collateral marks only      
Term/Maturity Jan. 07, 2020      
Outstanding Borrowings $ 295,984 316,219    
Potential Borrowings $ 344,656 $ 420,414    
Credit Facilities [Member] | Bank of America - Multi. JV [Member]        
Line of Credit Facility [Line Items]        
Guarantee 43.00%      
Margin Call Collateral marks only      
Term/Maturity Jul. 19, 2021      
Outstanding Borrowings $ 69,600      
Potential Borrowings $ 69,600      
Credit Facilities [Member] | Goldman Sachs - Multi. JV [Member]        
Line of Credit Facility [Line Items]        
Guarantee 25.00%      
Margin Call Collateral marks only      
Term/Maturity Jul. 12, 2020      
Outstanding Borrowings $ 45,008      
Potential Borrowings $ 45,008