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Summary of Stock Option (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Options  
Beginning balance | shares 1,456,200
Grants | shares 150,000
Cancellations | shares (6,625)
Expirations | shares (3,750)
Ending balance | shares 1,595,825
Options exercisable at End of Period | shares 1,246,923
Weighted-average exercise price  
Beginning balance | $ / shares $ 13.64
Grants | $ / shares 13.75
Cancellations | $ / shares 18.23
Expirations | $ / shares 15.41
Ending balance | $ / shares 13.63
Options exercisable at End of Period | $ / shares $ 13.04
Weighted-average remaining contractual life (years)  
Options outstanding, Ending balance 4 years 9 months 18 days
Options exercisable, Ending balance 3 years 9 months 18 days
Aggregate intrinsic value  
Options outstanding, end of period | $ $ 1,393
Options exercisable, end of period | $ $ 1,393