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The Incentive Stock Plans - Incentive Stock Plans Option Activity (Detail) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance 1,050,523  
Options cancelled/forfeited/expired, Shares Available for Grant 74,862  
Restricted stock awards issued, Shares Available for Grant (280,510)  
Shares Available for Grant, Ending Balance 844,875 1,050,523
Options Outstanding, Beginning Balance 1,937,874  
Options cancelled/forfeited/expired, Options Outstanding (74,862)  
Options exercised, Options Outstanding (14,849)  
Options Outstanding, Ending Balance 1,848,163 1,937,874
Exercisable as of December 31, 2015, Options Outstanding 1,114,662  
Aggregate Intrinsic Value, Beginning Balance $ 6,285  
Aggregate Intrinsic Value, Ending Balance 12,749 $ 6,285
Exercisable at December 31, 2015, Aggregate Intrinsic Value $ 10,663  
Weighted Average Exercise Price, Beginning Balance $ 12.95  
Options cancelled/forfeited/expired, Weighted Average Exercise Price 23.24  
Options exercised, Weighted Average Exercise Price 8.29  
Weighted Average Exercise Price, Ending Balance 12.57 $ 12.95
Exercisable at December 31, 2015, Weighted Average Exercise Price $ 10.43  
Weighted Average Remaining Contractual Life 6 years 4 months 24 days 6 years 6 months
Exercisable as of December 31, 2015, Weighted Average Remaining Contractual Life 5 years 1 month 6 days