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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, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2018
EUR (€)
Sep. 30, 2018
GBP (£)
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 5,409,815      
Potential Borrowings $ 4,850,911      
Rate 1.77%      
Advance Rate 79.20%      
Credit Facilities [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 4,850,911 $ 4,068,249    
Potential Borrowings $ 5,409,814 $ 4,664,097    
Advance Rate 79.20% 78.70%    
Credit Facilities [Member] | 1-Month USD LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 5,024,025      
Potential Borrowings $ 4,551,603      
Rate 1.75%      
Advance Rate 79.20%      
Credit Facilities [Member] | 3-Month EUR LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings | €     € 54,869  
Potential Borrowings | €     € 12,100  
Rate 2.28%      
Advance Rate 80.00%      
Credit Facilities [Member] | 3-Month GBP LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings | £       £ 247,194
Potential Borrowings | £       £ 218,914
Rate 1.97%      
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 $ 850,687 $ 1,170,801    
Potential Borrowings $ 1,160,678 1,289,135    
Credit Facilities [Member] | MetLife [Member]        
Line of Credit Facility [Line Items]        
Guarantee 50.00%      
Margin Call Collateral marks only      
Term/Maturity Apr. 22, 2023      
Outstanding Borrowings $ 737,770 807,164    
Potential Borrowings $ 737,770 807,164    
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, 2023      
Outstanding Borrowings $ 863,592 573,542    
Potential Borrowings $ 863,592 573,542    
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 $ 235,229 300,871    
Potential Borrowings $ 235,229 300,871    
Credit Facilities [Member] | Deutsche Bank [Member]        
Line of Credit Facility [Line Items]        
Guarantee 32.00%      
Margin Call Collateral marks only      
Term/Maturity Aug. 09, 2021      
Outstanding Borrowings $ 277,247 295,743    
Potential Borrowings $ 277,247 295,743    
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 $ 480,129 240,881    
Potential Borrowings $ 576,369 354,354    
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 $ 278,770 216,044    
Potential Borrowings $ 329,256 456,344    
Credit Facilities [Member] | JP Morgan [Member]        
Line of Credit Facility [Line Items]        
Guarantee 50.00%      
Margin Call Collateral marks only      
Term/Maturity Jan. 07, 2021      
Outstanding Borrowings $ 332,909 319,755    
Potential Borrowings $ 435,095 443,496    
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 $ 59,720 85,560    
Potential Borrowings $ 59,720 85,560    
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 $ 117,498 57,888    
Potential Borrowings $ 117,498 $ 57,888    
Credit Facilities [Member] | Barclays [Member]        
Line of Credit Facility [Line Items]        
Guarantee 25.00%      
Margin Call Collateral marks only      
Term/Maturity Mar. 29, 2023      
Outstanding Borrowings $ 617,360      
Potential Borrowings $ 617,360