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The Incentive Stock Plans - Additional Information (Detail) (USD $)
 3 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Feb. 28, 2013
Incentive Stock Plan 2011 [Member]
Dec. 31, 2013
Incentive Stock Plan 2011 [Member]
Feb. 28, 2013
Incentive Stock Plan 2011 [Member]
Minimum [Member]
Feb. 28, 2013
Incentive Stock Plan 2011 [Member]
Maximum [Member]
Dec. 31, 2013
Incentive Stock Plans [Member]
Dec. 31, 2012
Incentive Stock Plans [Member]
Dec. 31, 2013
Incentive Stock Plan 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common stock, shares authorized 1,000,000 500,000   2,000,000 1,200,456 2,200,456      
Additional shares threshold 52,837   1,000,000            
Number of Common stock shares available                 200,456
Expiration of Plan 2011       2021          
Contractual term of plan 2011       10 years          
Weighted average grant fair value of options granted $ 6.24 $ 4.48              
Total intrinsic value of options exercised $ 1,400,000 $ 74,000              
Weighted average period unrecognized compensation costs related to non-vested options             2 years 7 months 6 days 2 years 7 months 6 days  
Unrecognized compensation costs related to non-vested options 3,200,000 2,400,000              
Fair value of options vested $ 1,000,000 $ 1,100,000