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Borrowings Under Repurchase Agreements - Weighted Average Maturities and Interest Rates of Borrowings (Detail)
£ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2017
GBP (£)
Mar. 31, 2017
USD ($)
Sep. 29, 2016
USD ($)
Sep. 29, 2016
GBP (£)
Debt Instrument [Line Items]            
Borrowings Outstanding $ 1,330,909,000 $ 1,139,803,000        
Less: deferred financing costs (9,345,000) (6,763,000)        
Line of Credit [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings 2,153,412,000        
Borrowings Outstanding 1,330,909,000 1,139,803,000        
Less: deferred financing costs $ (9,345,000) $ (6,763,000)        
Weighted Average Rate 3.53% 3.18% 3.53%      
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Basis point 1.22% 0.77%        
JP Morgan Chase DB Repurchase Facility, and Goldman Sachs [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings $ 1,719,513,000        
Borrowings Outstanding $ 1,096,084,000 $ 835,464,000        
JP Morgan Chase DB Repurchase Facility, and Goldman Sachs [Member] | Weighted Average [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Basis point 2.37% 2.38%        
JPMorgan Facility [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings $ 1,118,000,000 $ 943,000,000        
Borrowings Outstanding 794,404,000 $ 657,452,000        
JPMorgan Facility [Member] | Line of Credit [Member] | General Facility [Member]            
Debt Instrument [Line Items]            
Long-term line of credit 975,000,000          
JPMorgan Facility [Member] | Line of Credit [Member] | Asset Specific Financing [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings       $ 143,000,000    
Long-term line of credit $ 143,000,000          
JPMorgan Facility [Member] | Weighted Average [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Basis point 2.26% 2.25%        
DB Repurchase Facility [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings $ 563,813,000 $ 300,000,000     $ 563,813,000  
Borrowings Outstanding 263,980,000 $ 137,355,000        
DB Repurchase Facility [Member] | Line of Credit [Member] | General Facility [Member]            
Debt Instrument [Line Items]            
Long-term line of credit 450,000,000   £ 45,000   450,000,000 £ 45,000
DB Repurchase Facility [Member] | Line of Credit [Member] | Asset Specific Financing [Member]            
Debt Instrument [Line Items]            
Long-term line of credit $ 55,200,000       $ 55,200,000  
DB Repurchase Facility [Member] | Weighted Average [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Basis point 2.56% 2.66%        
DB Repurchase Facility [Member] | Minimum [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Basis point 2.10%          
DB Repurchase Facility [Member] | Maximum [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Basis point 3.00%          
Goldman Loan [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Borrowings Outstanding $ 37,700,000 $ 40,657,000        
Goldman Loan [Member] | Weighted Average [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Basis point 3.50% 3.50%        
UBS and Deutsche Bank [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings $ 433,899,000        
Borrowings Outstanding $ 244,170,000 $ 311,102,000        
Weighted Average Rate 3.25% 3.27% 3.25%      
UBS Facility [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings $ 133,899,000          
Borrowings Outstanding $ 100,798,000 $ 133,899,000        
Weighted Average Rate 2.77% 2.79% 2.77%      
DB Facility [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Maximum Amount of Borrowings $ 300,000,000          
Borrowings Outstanding $ 143,372,000 $ 177,203,000        
Weighted Average Rate 3.59% 3.63% 3.59%      
DB Facility [Member] | Minimum [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Basis point 1.80%          
DB Facility [Member] | Maximum [Member] | Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Basis point 2.32%