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Summary of Stock Option (Detail)
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Options  
Beginning balance | shares 2,326,627
Grants | shares 29,600
Exercises | shares (110,375)
Cancellations | shares (30,750)
Expirations | shares (23,900)
Ending balance | shares 2,191,202
Options exercisable at End of Period | shares 1,670,910
Weighted-average exercise price  
Beginning balance $ 14.19
Grants 15.23
Exercises 8.84
Cancellations 15.62
Expirations 27.23
Ending balance 14.31
Options exercisable at End of Period $ 13.82
Weighted-average remaining contractual life (years)  
Options outstanding, Ending balance 5 years 3 months 18 days
Options exercisable, Ending balance 4 years 6 months
Aggregate intrinsic value  
Options outstanding, end of period | $ $ 4,798,000
Options exercisable, end of period | $ $ 4,422,000