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Secured Debt Agreements, Net - Summary of Key Terms of Credit Facilities (Detail)
€ in Thousands, £ in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2017
GBP (£)
Jun. 30, 2017
EUR (€)
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 4,014,582      
Potential Borrowings $ 4,501,956      
Rate 1.90%      
Advance Rate 78.80%      
Credit Facilities [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 4,014,582 $ 3,572,837    
Potential Borrowings $ 4,501,956 $ 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 $ 3,684,398      
Potential Borrowings $ 4,103,296      
Rate 1.88%      
Advance Rate 78.80%      
Credit Facilities [Member] | 3-Month EURIBOR [Member]        
Line of Credit Facility [Line Items]        
Potential Borrowings | €       € 38,227
Advance Rate 77.80%      
Credit Facilities [Member] | 3-Month GBP LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings | £     £ 253,500  
Potential Borrowings | £     £ 273,451  
Rate 2.15%      
Advance Rate 79.00%      
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 $ 1,232,179 $ 1,107,733    
Potential Borrowings $ 1,548,713 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 $ 795,207 862,454    
Potential Borrowings $ 795,207 862,454    
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 $ 348,486 207,178    
Potential Borrowings $ 354,959 207,178    
Credit Facilities [Member] | Deutsche Bank [Member]        
Line of Credit Facility [Line Items]        
Guarantee 25.00%      
Margin Call Collateral marks only      
Term/Maturity Term matched      
Outstanding Borrowings $ 284,174      
Potential Borrowings $ 284,174      
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 $ 258,450 229,629    
Potential Borrowings $ 307,201 394,677    
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 $ 254,345 231,930    
Potential Borrowings $ 321,848 272,221    
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 $ 200,675 316,219    
Potential Borrowings $ 248,788 $ 420,414