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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, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2018
EUR (€)
Jun. 30, 2018
GBP (£)
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 4,649,246      
Potential Borrowings $ 5,384,738      
Rate 1.79%      
Advance Rate 79.10%      
Credit Facilities [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 4,649,246 $ 4,068,249    
Potential Borrowings $ 5,384,738 $ 4,664,097    
Advance Rate 79.10% 78.70%    
Credit Facilities [Member] | 1-Month USD LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings $ 4,339,522      
Potential Borrowings $ 5,055,273      
Rate 1.77%      
Advance Rate 79.10%      
Credit Facilities [Member] | 3-Month EURIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings | €     € 49,600  
Potential Borrowings | €     € 59,201  
Rate 2.28%      
Advance Rate 80.00%      
Credit Facilities [Member] | 3-Month GBP LIBOR [Member]        
Line of Credit Facility [Line Items]        
Outstanding Borrowings | £       £ 117,994
Potential Borrowings | £       £ 124,449
Rate 2.23%      
Advance Rate 78.50%      
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 $ 852,431 $ 1,170,801    
Potential Borrowings $ 1,348,240 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 $ 793,130 807,164    
Potential Borrowings $ 793,130 807,164    
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 33.00%      
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 $ 459,827 240,881    
Potential Borrowings $ 572,341 354,354    
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 $ 280,847 216,044    
Potential Borrowings $ 344,960 456,344    
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 $ 296,058 319,755    
Potential Borrowings $ 359,114 443,496    
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 $ 39,320 85,560    
Potential Borrowings $ 39,320 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 $ 55,085 57,888    
Potential Borrowings $ 55,085 $ 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 $ 496,480      
Potential Borrowings $ 496,480