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Share-based Compensation - Summary of Restricted Stock Activity (Detail) - Restricted Stock [Member] - $ / shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-vested shares, beginning of the year     60  
Shares, Granted     120  
Shares, Vested     (145)  
Shares, Forfeited     (12)  
Non-vested shares, end of the year 23   23  
Weighted Average Grant Date Fair Value, Non-vested restricted stock, beginning of the year     $ 15.91  
Weighted Average Grant Date Fair Value, Granted $ 19.42 $ 15.13 15.36 $ 15.29
Weighted Average Grant Date Fair Value, Vested     15.17  
Weighted Average Grant Date Fair Value, Forfeited     17.76  
Weighted Average Grant Date Fair Value, Non-vested restricted stock, end of the period $ 16.74   $ 16.74