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Summary of Stock Option (Detail)
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Options  
Beginning balance | shares 2,242,202
Grants | shares 56,850
Exercises | shares (138,443)
Cancellations | shares (23,375)
Expirations | shares (218,100)
Ending balance | shares 1,919,134
Options exercisable at End of Period | shares 1,566,326
Weighted-average exercise price  
Beginning balance | $ / shares $ 14.28
Grants | $ / shares 15.69
Exercises | $ / shares 8.60
Cancellations | $ / shares 15.32
Expirations | $ / shares 27.93
Ending balance | $ / shares 13.16
Options exercisable at End of Period | $ / shares $ 12.45
Weighted-average remaining contractual life (years)  
Options outstanding, Ending balance 5 years 2 months 12 days
Options exercisable, Ending balance 4 years 7 months 6 days
Aggregate intrinsic value  
Options outstanding, end of period | $ $ 4,879,600
Options exercisable, end of period | $ $ 4,702,600