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Secured Debt Agreements, Net - Summary of Key Terms of Credit Facilities (Detail)
€ in Thousands, £ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
GBP (£)
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 4,068,249      
Potential Borrowings $ 4,664,097      
Rate 1.90%      
Advance Rate 78.70%      
Credit Facilities [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 4,068,249 $ 3,572,837    
Potential Borrowings $ 4,664,097 $ 4,114,580    
Advance Rate 78.70% 79.10%    
Credit Facilities [Member] | 1-Month USD LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 3,798,619      
Potential Borrowings $ 4,275,789      
Rate 1.87%      
Advance Rate 78.60%      
Credit Facilities [Member] | 3-Month EURIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings | €     € 66,144  
Potential Borrowings | €     € 87,744  
Rate 2.24%      
Advance Rate 80.00%      
Credit Facilities [Member] | 3-Month GBP LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings | £       £ 140,771
Potential Borrowings | £       £ 209,406
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 $ 1,170,801 $ 1,107,733    
Potential Borrowings $ 1,289,135 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 $ 573,542 617,694    
Potential Borrowings $ 573,542 617,694    
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 $ 300,871 207,178    
Potential Borrowings $ 300,871 207,178    
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 $ 240,881 229,629    
Potential Borrowings $ 354,354 394,677    
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 $ 216,044 231,930    
Potential Borrowings $ 456,344 272,221    
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 $ 319,755 316,219    
Potential Borrowings $ 443,496 $ 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 $ 85,560      
Potential Borrowings $ 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 $ 57,888      
Potential Borrowings $ 57,888