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Summary of Stock Option (Detail) - Jun. 30, 2015 - USD ($)
Total
Options  
Beginning balance 2,326,627
Grants 29,600
Exercises (84,825)
Cancellations (19,000)
Expirations (16,000)
Ending balance 2,236,402
Options exercisable at End of Period 1,704,360
Weighted-average exercise price  
Beginning balance $ 14.19
Grants 15.23
Exercises 7.95
Cancellations 15.09
Expirations 29.96
Ending balance 14.32
Options exercisable at End of Period $ 13.82
Weighted-average remaining contractual life (years)  
Options outstanding, Ending balance 5 years 7 months 6 days
Options exercisable, Ending balance 4 years 9 months 18 days
Aggregate intrinsic value  
Options outstanding, end of period $ 6,084,000
Options exercisable, end of period $ 5,526,000