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Secured Debt Agreements - Revolving Repurchase Facilities (Parenthetical) (Detail)
Sep. 30, 2016
USD ($)
Sep. 30, 2016
GBP (£)
Sep. 30, 2016
EUR (€)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
GBP (£)
Revolving Repurchase Facilities [Member]          
Line of Credit Facility [Line Items]          
Maximum Facility Size $ 5,523,080,000     $ 4,332,267,000  
Revolving Repurchase Facilities [Member] | Morgan Stanley [Member]          
Line of Credit Facility [Line Items]          
Maximum Facility Size 324,200,000 £ 250,000,000   370,400,000  
Revolving Repurchase Facilities [Member] | Societe Generale [Member]          
Line of Credit Facility [Line Items]          
Maximum Facility Size 448,880,000   € 400,000,000 437,320,000  
Revolving Repurchase Facilities [Member] | JP Morgan [Member]          
Line of Credit Facility [Line Items]          
Maximum Facility Size 500,000,000     524,547,000  
Revolving Repurchase Facilities [Member] | JP Morgan [Member] | $250.0 Million Facility [Member]          
Line of Credit Facility [Line Items]          
Maximum Facility Size $ 500,000,000     250,000,000  
Revolving Repurchase Facilities [Member] | JP Morgan [Member] | UK Pound Sterling 153.0 Million ($226.7 Million) Facility [Member]          
Line of Credit Facility [Line Items]          
Maximum Facility Size       226,700,000 £ 153,000,000
Pledged Assets Repayment Revolving Repurchase Facilities [Member] | JP Morgan [Member]          
Line of Credit Facility [Line Items]          
Maximum Facility Size       $ 47,800,000 £ 32,300,000