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Summary of Stock Option (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Options  
Beginning balance 2,528,177
Grants 390,800
Exercises (207,977)
Cancellations (45,000)
Expirations (231,500)
Ending balance 2,434,500
Options exercisable at End of Period 1,524,450
Weighted-average exercise price  
Beginning balance $ 13.06
Grants $ 12.26
Exercises $ 4.54
Cancellations $ 19.37
Expirations $ 22.46
Ending balance $ 12.65
Options exercisable at End of Period $ 13.02
Weighted Average Remaining Contractual Term  
Options outstanding, Ending balance 6 years 5 months 23 days
Options exercisable, Ending balance 5 years 7 months 2 days
Aggregate Intrinsic Value  
Options outstanding, end of period $ 10,484,325
Options exercisable, end of period $ 7,517,920