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Status Summary of Non-Vested Shares (Detail) - $ / shares
3 Months Ended 6 Months Ended
Jun. 08, 2016
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of Shares, Granted           289,977  
Number of Shares, Vested           (24,312)  
Weighted Average Grant-Date Fair Value, Granted           $ 16.23  
Performance Based Restricted Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of Shares, Beginning balance   240,216 119,022 95,008 104,403 119,022 104,403
Number of Shares, Granted   7,400 121,194 52,170   128,594 52,170
Number of Shares, Vested   (48,046)          
Number of Shares, Forfeited   (12,560)   (19,612) (9,395)    
Number of Shares, Ending Balance   187,010 240,216 127,566 95,008 187,010 127,566
Weighted Average Grant-Date Fair Value, Beginning balance   $ 14.80 $ 14.18 $ 16.99 $ 17.05 $ 14.18 $ 17.05
Weighted Average Grant-Date Fair Value, Granted $ 14.39 15.88 15.40 14.39   15.43  
Weighted Average Grant-Date Fair Value, Vested   14.92          
Weighted Average Grant-Date Fair Value, Forfeited   12.92   28.25 17.65    
Weighted Average Grant-Date Fair Value, Ending balance   $ 14.93 $ 14.80 $ 14.20 $ 16.99 $ 14.93 $ 14.20