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Secured Debt Agreements, Net - Summary of Key Terms of Credit Facilities (Detail)
€ in Thousands, £ in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2017
GBP (£)
Mar. 31, 2017
EUR (€)
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 3,958,064      
Potential Borrowings $ 4,407,600      
Rate 1.90%      
Advance Rate 78.90%      
Credit Facilities [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 3,958,064 $ 3,572,837    
Potential Borrowings $ 4,407,600 $ 4,114,580    
Advance Rate 78.90% 79.10%    
Credit Facilities [Member] | 1-Month USD LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 3,639,921      
Potential Borrowings $ 4,030,008      
Rate 1.88%      
Advance Rate 78.90%      
Credit Facilities [Member] | 3-Month EURIBOR [Member]        
Line of Credit Facility [Line Items]        
Potential Borrowings | €       € 38,269
Advance Rate 77.80%      
Credit Facilities [Member] | 3-Month GBP LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings | £     £ 253,500  
Potential Borrowings | £     £ 269,273  
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 $ 1,238,872 $ 1,107,733    
Potential Borrowings $ 1,468,184 1,339,942    
Credit Facilities [Member] | MetLife [Member]        
Line of Credit Facility [Line Items]        
Guarantee 50.00%      
Margin Call Collateral marks only      
Term/Maturity April 22, 2022      
Outstanding Borrowings $ 866,114 862,454    
Potential Borrowings $ 866,114 862,454    
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] | Citibank [Member]        
Line of Credit Facility [Line Items]        
Guarantee 25.00%      
Margin Call Collateral marks only      
Term/Maturity Term matched      
Outstanding Borrowings $ 295,777 229,629    
Potential Borrowings $ 393,933 394,677    
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 $ 278,851      
Potential Borrowings $ 278,851      
Credit Facilities [Member] | Morgan Stanley [Member]        
Line of Credit Facility [Line Items]        
Guarantee 25.00%      
Margin Call Collateral marks only      
Term/Maturity March 1, 2020      
Outstanding Borrowings $ 220,969 231,930    
Potential Borrowings $ 260,623 272,221    
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 $ 214,678 207,178    
Potential Borrowings $ 220,915 207,178    
Credit Facilities [Member] | JP Morgan [Member]        
Line of Credit Facility [Line Items]        
Guarantee 50.00%      
Margin Call Collateral marks only      
Term/Maturity January 7, 2019      
Outstanding Borrowings $ 201,737 316,219    
Potential Borrowings $ 277,914 $ 420,414