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Borrowings Under Repurchase Agreements - Additional Information (Detail)
£ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
subsidiary
Sep. 29, 2016
USD ($)
extension
Jan. 26, 2015
USD ($)
Apr. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2017
GBP (£)
Sep. 29, 2016
GBP (£)
Debt Instrument [Line Items]                    
Borrowing outstanding           $ 1,330,909,000 $ 1,330,909,000 $ 1,139,803,000    
Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing under facility           2,153,412,000 2,153,412,000    
Borrowing outstanding           1,330,909,000 $ 1,330,909,000 $ 1,139,803,000    
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread             1.22% 0.77%    
Line of Credit [Member] | JPMorgan Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing under facility           1,118,000,000 $ 1,118,000,000 $ 943,000,000    
Borrowing outstanding           794,404,000 794,404,000 657,452,000    
Line of Credit [Member] | DB Repurchase Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing under facility   $ 563,813,000       563,813,000 563,813,000 300,000,000    
Borrowing outstanding           263,980,000 263,980,000 137,355,000    
Number of extensions available | extension   2                
Line of credit facility, potential extension period   1 year                
Line of Credit [Member] | Goldman Loan [Member]                    
Debt Instrument [Line Items]                    
Borrowing outstanding           37,700,000 37,700,000 40,657,000    
Line of Credit [Member] | UBS Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing under facility           133,899,000 133,899,000      
Borrowing outstanding           100,798,000 100,798,000 133,899,000    
Line of Credit [Member] | DB Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing under facility           300,000,000 300,000,000      
Borrowing outstanding           $ 143,372,000 $ 143,372,000 $ 177,203,000    
Minimum [Member] | Line of Credit [Member] | DB Repurchase Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread             2.10%      
Minimum [Member] | Line of Credit [Member] | DB Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread             1.80%      
Maximum [Member] | Line of Credit [Member] | DB Repurchase Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread             3.00%      
Maximum [Member] | Line of Credit [Member] | DB Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread             2.32%      
JP Morgan Facility [Member] | Line of Credit [Member] | JPMorgan Facility [Member]                    
Debt Instrument [Line Items]                    
Number of indirect wholly owned subsidiaries | subsidiary 2                  
Amended and Restated JPMorgan Facility [Member] | Line of Credit [Member] | JPMorgan Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing under facility $ 1,118,000,000                  
Debt extension option 1 year                  
Threshold amount for margin calls (more than) $ 250,000                  
Amended and Restated JPMorgan Facility [Member] | Minimum [Member] | Line of Credit [Member] | JPMorgan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread           2.25%        
Amended and Restated JPMorgan Facility [Member] | Maximum [Member] | Line of Credit [Member] | JPMorgan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread           4.75%        
Repurchase Facility [Member] | Line of Credit [Member] | JPMorgan Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing under facility 975,000,000                  
Asset Specific Financing [Member] | Line of Credit [Member] | JPMorgan Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing under facility $ 143,000,000                  
Long-term line of credit           $ 143,000,000 $ 143,000,000      
Asset Specific Financing [Member] | Line of Credit [Member] | DB Repurchase Facility [Member]                    
Debt Instrument [Line Items]                    
Long-term line of credit   $ 55,200,000       55,200,000 55,200,000      
General Facility [Member] | Line of Credit [Member] | JPMorgan Facility [Member]                    
Debt Instrument [Line Items]                    
Long-term line of credit           975,000,000 975,000,000      
General Facility [Member] | Line of Credit [Member] | DB Repurchase Facility [Member]                    
Debt Instrument [Line Items]                    
Long-term line of credit   $ 450,000,000       450,000,000 450,000,000   £ 45,000 £ 45,000
Goldman Facility [Member] | Line of Credit [Member] | Goldman Loan [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing under facility           $ 37,700,000 $ 37,700,000      
Covenant terms, minimum consolidated tangible net worth, amount     $ 750,000,000              
Covenant terms, maximum debt to tangible net worth ratio     3              
Covenant terms, minimum liquidity     $ 15,000,000              
Line of credit facility, covenant terms, total consolidated indebtedness, percent     5.00%              
Line of credit facility, covenant terms, minimum net income during any four consecutive quarters     $ 1              
Covenant terms, minimum EBITDA to interest expense ratio     1.5              
Goldman Facility [Member] | Line of Credit [Member] | Goldman Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Basis spread     3.50%              
UBS Facility [Member] | Line of Credit [Member] | UBS Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing under facility         $ 133,899          
Line of credit facility, potential extension period         1 year          
Covenant terms, maximum debt to tangible net worth ratio         3          
Line of credit, covenant, minimum net asset value         $ 500,000          
UBS Facility [Member] | Line of Credit [Member] | UBS Facility [Member] | Six Month LIBOR [Member]                    
Debt Instrument [Line Items]                    
Basis spread         1.55%          
DB Facility [Member] | Line of Credit [Member] | DB Facility [Member]                    
Debt Instrument [Line Items]                    
Maximum borrowing under facility       $ 300,000,000            
Line of credit, covenant, minimum shareholder's equity of gross capital Proceeds       50.00%            
DB Facility [Member] | Minimum [Member] | Line of Credit [Member] | DB Facility [Member] | Three Month LIBOR [Member]                    
Debt Instrument [Line Items]                    
Basis spread       1.80%            
DB Facility [Member] | Maximum [Member] | Line of Credit [Member] | DB Facility [Member] | Three Month LIBOR [Member]                    
Debt Instrument [Line Items]                    
Basis spread       2.32%            
Line of credit facility, non-use commitment fee percentage       1.80%