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Stock Compensation - Summary of Changes in Company's Nonvested Restricted Shares (Detail) - Restricted Stock [Member]
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares, Nonvested shares, Beginning balance | shares 260,490
Shares, Granted | shares 192,874
Shares, Vested | shares (107,258)
Shares, Forfeited | shares (2,928)
Shares, Nonvested shares, Ending balance | shares 343,178
Weighted average grant date fair value, Nonvested shares, Beginning balance | $ / shares $ 4.68
Weighted average grant date fair value, Granted | $ / shares 6.00
Weighted average grant date fair value, Vested | $ / shares 4.58
Weighted average grant date fair value, Forfeited | $ / shares 4.53
Weighted average grant date fair value, Nonvested shares, Ending balance | $ / shares $ 5.45