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Summary of Outstanding and Non-Vested Stock Option and Restricted Stock Activity (Detail) (USD $)
3 Months Ended
Dec. 31, 2012
Stock Options
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance, Shares 612,071
Granted, Shares 47,470
Exercised, Shares (30,681)
Expired / Cancelled, Shares (13,000)
Ending Balance, Shares 615,860
Beginning Balance, Weighted Average Exercise price $ 8.47
Granted, Weighted Average Fair Value $ 11.93
Exercised, Weighted Average Fair Value $ 8.08
Expired / Cancelled, Restricted Stock Weighted Average Exercise Price $ 8.32
End of period, Weighted Average Exercise Price $ 8.76
Non Vested Stock Options
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance, Shares 138,835
Granted, Shares 47,470
Vested, Shares (77,184)
Ending Balance, Shares 109,121
Beginning Balance, Weighted Average Exercise price $ 3.55
Granted, Weighted Average Fair Value $ 5.41
Vested, Weighted Average Fair Value $ 3.61
End of period, Weighted Average Exercise Price $ 4.31
Restricted Stock
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance, Outstanding and Non Vested, Weighted average fair value per share $ 7.52
Granted, Restricted Stock Weighted Average Exercise Price $ 11.93
Vested Outstanding and Non-Vested Weighted Average Fair Value $ 7.42
Exercised, Restricted Stock Weighted Average Exercise Price   
Ending Balance, Outstanding and Non-Vested, Weighted Average Fair Value Per Share $ 9.80
Beginning Balance, Outstanding and Non-Vested shares 64,497
Granted, Outstanding and Non vested shares 36,060
Vested Outstanding and Non vested, shares (29,505)
Exercised, Outstanding and Non vested, shares   
Expired / Cancelled, Outstanding and Non vested, shares   
Ending Balance, Outstanding and Non-Vested Shares 71,052