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The Incentive Stock Plans - Incentive Stock Plans Activity (Detail) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance   732,103
Options authorized, Shares Available for Grant   1,000,000
Options cancelled/forfeited/expired, Shares Available for Grant   56,667
Restricted stock awards issued, Shares Available for Grant   (358,342)
Restricted stock awards forfeited, Shares Available for Grant   8,000
Additional shares of stock issued, Shares Available for Grant   (40,992)
Shares Available for Grant, Ending Balance 732,103 1,397,436
Options Outstanding, Beginning Balance   1,451,102
Options cancelled/forfeited/expired, Options Outstanding   (56,667)
Options exercised, Options Outstanding   (175,431)
Options Outstanding, Ending Balance 1,451,102 1,219,004
Exercisable as of June 30, 2017, Options Outstanding   971,670
Aggregate Intrinsic Value $ 12,397 $ 9,166
Exercisable as of June 30, 2017, Aggregate Intrinsic Value   $ 8,300
Weighted Average Exercise Price, Beginning Balance   $ 12.33
Options cancelled/forfeited/expired, Weighted Average Exercise Price   23.29
Options exercised, Weighted Average Exercise Price   12.21
Weighted Average Exercise Price, Ending Balance $ 12.33 11.83
Exercisable as of June 30, 2017, Weighted Average Exercise Price   $ 10.81
Weighted Average Remaining Contractual Life 6 years 5 years 6 months
Exercisable as of June 30, 2017, Weighted Average Remaining Contractual Life   5 years 1 month 6 days