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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
6 Months Ended
Jun. 30, 2016
Jun. 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 0
Exercised, Number of Shares 0  
Forfeited, Number of Shares (3,000)  
Outstanding (vested and expected to vest) at June 30, 2016, Number of Shares 53,250  
Exercisable at June 30, 2016, Number of Shares 30,500  
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 0.00  
Forfeited, Weighted Average Exercise Price per Share 71.62  
Outstanding (vested and expected to vest) at June 30, 2016, Weighted Average Exercise Price per Share 54.38  
Exercisable at June 30, 2016, Weighted Average Exercise Price per Share $ 58.24  
Outstanding (vested and expected to vest) at June 30, 2016, Weighted Average Remaining Contractual Term 6 years 3 months 18 days  
Exercisable at June 30, 2016, Weighted Average Remaining Contractual Term 7 years  
Outstanding (vested and expected to vest) at June 30, 2016 , Aggregate Intrinsic Value $ 5  
Exercisable at June 30, 2016 , Aggregate Intrinsic Value $ 0