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Share-Based Payments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 23, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Recognized stock-based compensation expense $ 756 $ 308 $ 2,695 $ 1,096  
LTIP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of issued and outstanding shares of common stock provides for grants of restricted common stock, restricted stock units and other equity-based awards         7.50%
LTIP [Member] | Restricted Stock and Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Recognized stock-based compensation expense 756 $ 308 2,695 $ 1,096  
LTIP [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense 1,074   1,074    
LTIP [Member] | RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense $ 5,104   $ 5,104    
Common stock, shares delivered     12,763    
Stock units vested (in shares)     20,000    
Adjustment to additional paid in capital, tax liability     $ 122