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Share-Based Compensation - Activity in Company's Plan - Long Term Incentive Plan (Detail) - Long Term Incentive Plan Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding at January 1, 2016, Number of Shares 56,250  
Granted, Number of Shares 0 2,000
Exercised, Number of Shares (1,000) 0
Forfeited, Number of Shares (3,000)  
Outstanding (vested and expected to vest) at September 30, 2016, Number of Shares 52,250  
Exercisable at September 30, 2016, Number of Shares 31,750  
Outstanding at January 1, 2016, Weighted Average Exercise Price per Share $ 55.30  
Granted, Weighted Average Exercise Price per Share 0.00  
Exercised, Weighted Average Exercise Price per Share 37.44  
Forfeited, Weighted Average Exercise Price per Share 71.62  
Outstanding (vested and expected to vest) at September 30, 2016, Weighted Average Exercise Price per Share 54.71  
Exercisable at September 30, 2016, Weighted Average Exercise Price per Share $ 58.17  
Outstanding (vested and expected to vest) at September 30, 2016, Weighted Average Remaining Contractual Term 6 years 2 months 12 days  
Exercisable at September 30, 2016, Weighted Average Remaining Contractual Term 7 years 1 month 6 days  
Outstanding (vested and expected to vest) at September 30, 2016 , Aggregate Intrinsic Value $ 5  
Exercisable at September 30, 2016 , Aggregate Intrinsic Value $ 5