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Share-Based Payments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Sep. 23, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized stock-based compensation expense $ 3,791 $ 1,668  
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense 2,128    
RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense $ 23,539    
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%
Common stock, shares delivered (in shares) 198,598    
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 $ 3,791 $ 1,668  
LTIP [Member] | RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock units vested (in shares) 332,349    
Adjustment to additional paid in capital, tax liability $ 2,330