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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, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2018
GBP (£)
Mar. 31, 2018
EUR (€)
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 3,851,609      
Potential Borrowings $ 4,665,513      
Rate 1.84%      
Advance Rate 78.80%      
Credit Facilities [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 3,851,609 $ 4,068,249    
Potential Borrowings $ 4,665,513 $ 4,664,097    
Advance Rate 78.80% 78.70%    
Credit Facilities [Member] | 1-Month USD LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 3,592,644      
Potential Borrowings $ 4,272,553      
Rate 1.81%      
Advance Rate 78.80%      
Credit Facilities [Member] | 3-Month EURIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings | €       € 59,225
Potential Borrowings | €       € 80,825
Rate 2.25%      
Advance Rate 80.00%      
Credit Facilities [Member] | 3-Month GBP LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings | £     £ 132,771  
Potential Borrowings | £     £ 209,406  
Rate 2.23%      
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 $ 857,498 $ 1,170,801    
Potential Borrowings $ 1,205,597 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 $ 822,534 807,164    
Potential Borrowings $ 822,534 807,164    
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 $ 637,992 573,542    
Potential Borrowings $ 637,992 573,542    
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 $ 300,871 300,871    
Potential Borrowings $ 300,871 300,871    
Credit Facilities [Member] | Deutsche Bank [Member]        
Line of Credit Facility [Line Items]        
Guarantee 27.00%      
Margin Call Collateral marks only      
Term/Maturity Aug. 09, 2021      
Outstanding Borrowings $ 265,643 295,743    
Potential Borrowings $ 265,643 295,743    
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 $ 430,290 240,881    
Potential Borrowings $ 430,290 354,354    
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 $ 203,204 216,044    
Potential Borrowings $ 457,971 456,344    
Credit Facilities [Member] | JP Morgan [Member]        
Line of Credit Facility [Line Items]        
Guarantee 50.00%      
Margin Call Collateral marks only      
Term/Maturity Jan. 07, 2020      
Outstanding Borrowings $ 210,212 319,755    
Potential Borrowings $ 421,250 443,496    
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 $ 90,040 85,560    
Potential Borrowings $ 90,040 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 $ 33,325 57,888    
Potential Borrowings $ 33,325 $ 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