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Status Summary of Non-Vested Shares (Detail) - Performance Based Restricted Stock - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of Shares, Beginning balance 95,008 104,403 111,407 103,907 104,403 103,907
Number of Shares, Granted 52,170     7,500 52,170 7,500
Number of Shares, Forfeited (19,612) (9,395)        
Number of Shares, Ending Balance 127,566 95,008 111,407 111,407 127,566 111,407
Weighted Average Grant-Date Fair Value, Beginning balance $ 16.99 $ 17.05 $ 17.31 $ 17.77 $ 17.05 $ 17.77
Weighted Average Grant-Date Fair Value, Granted 14.39     10.96    
Weighted Average Grant-Date Fair Value, Forfeited 28.25 17.65        
Weighted Average Grant-Date Fair Value, Ending balance $ 14.20 $ 16.99 $ 17.31 $ 17.31 $ 14.20 $ 17.31