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Subsequent Events - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 26, 2016
Feb. 25, 2016
Jan. 31, 2016
Jan. 31, 2016
Dec. 31, 2015
Subsequent Event [Line Items]          
Asset coverage ratio         125.00%
Repayments on bank borrowings         $ 7,000
Executive Officer          
Subsequent Event [Line Items]          
Vesting period         3 years
Cash awards         $ 753
Subsequent Event          
Subsequent Event [Line Items]          
Asset coverage ratio     121.00%    
Repayments on bank borrowings $ 16,100 $ 16,100      
Subsequent Event | Restricted Stock          
Subsequent Event [Line Items]          
Shares or units awarded to certain employees       234,412  
Fair value of the stock award on the date of grant     $ 4,048 $ 4,048  
Vesting period       3 years  
Subsequent Event | Phantom Share Units (PSUs)          
Subsequent Event [Line Items]          
Shares or units awarded to certain employees       6,095  
Fair value of the stock award on the date of grant     105 $ 105  
Subsequent Event | Market Based Awards | Executive Officer          
Subsequent Event [Line Items]          
Vesting period       3 years  
Cash awards     $ 1,324 $ 1,324  
Subsequent Event | Market Based Awards | Executive Officer | Beginning January 1, 2016 through December 31, 2018          
Subsequent Event [Line Items]          
Vesting percentage       200.00%  
Subsequent Event | Market Based Awards | Executive Officer | Beginning January 1, 2016 through December 31, 2018 | Minimum          
Subsequent Event [Line Items]          
Vesting percentage       0.00%