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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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 10,500 35,500
Exercised, Number of Shares (500) 0 (1,250)
Forfeited, Number of Shares (3,000)    
Outstanding (vested and expected to vest) at December 31, 2016, Number of Shares 52,750    
Exercisable at December 31, 2016, Number of Shares 39,875    
Outstanding at January 1, 2016, Weighted Average Exercise Price per Share $ 55.30    
Granted, Weighted Average Exercise Price per Share 0    
Exercised, Weighted Average Exercise Price per Share 37.4    
Forfeited, Weighted Average Exercise Price per Share 71.62    
Outstanding (vested and expected to vest) at December 31, 2016, Weighted Average Exercise Price per Share 54.54    
Exercisable at December 31, 2016, Weighted Average Exercise Price per Share $ 55.42    
Outstanding (vested and expected to vest) at December 31, 2016, Weighted Average Remaining Contractual Term 5 years 9 months 18 days    
Exercisable at December 31, 2016, Weighted Average Remaining Contractual Term 7 years    
Outstanding (vested and expected to vest) at December 31, 2016, Aggregate Intrinsic Value $ 17    
Exercisable at December 31, 2016, Aggregate Intrinsic Value $ 19