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Share-Based Compensation - Stock Option Activity under Company's Plan - Long Term Incentive Plan (Detail) - Long Term Incentive Plan Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding at January 1, 2017, Number of Shares 52,750  
Granted, Number of Shares 0 0
Exercised, Number of Shares 0 0
Forfeited, Number of Shares 0  
Outstanding (vested and expected to vest) at March 31, 2017, Number of Shares 52,750  
Exercisable at March 31, 2017, Number of Shares 42,875  
Outstanding at January 1, 2017, Weighted Average Exercise Price per Share $ 54.54  
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 0.00  
Outstanding (vested and expected to vest) at March 31, 2017, Weighted Average Exercise Price per Share 54.54  
Exercisable at March 31, 2017, Weighted Average Exercise Price per Share $ 56.55  
Outstanding (vested and expected to vest) at March 31, 2017, Weighted Average Remaining Contractual Term (Years) 5 years 7 months 6 days  
Exercisable at March 31, 2017, Weighted Average Remaining Contractual Term (Years) 6 years 8 months 12 days  
Outstanding (vested and expected to vest) at March 31, 2017, Aggregate Intrinsic Value $ 158  
Exercisable at March 31, 2017, Aggregate Intrinsic Value $ 90