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Share-Based Payments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 23, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Recognized stock-based compensation expense $ 3,461 $ 1,938 $ 7,252 $ 3,606  
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense 2,063   2,063    
RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense $ 19,937   $ 19,937    
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)     200,569    
LTIP [Member] | RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock units vested (in shares)     334,320    
Adjustment to additional paid in capital, tax liability     $ 2,330