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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, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding at January 1, 2015, Number of Shares 47,750  
Granted, Number of Shares 0 17,000
Exercised, Number of Shares 0 1,250
Forfeited, Number of Shares (2,000)  
Outstanding (vested and expected to vest) at June 30, 2015, Number of Shares 45,750  
Exercisable at June 30, 2015, Number of Shares 19,750  
Outstanding at January 1, 2015, Weighted Average Exercise Price per Share $ 58.11  
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 52.21  
Outstanding (vested and expected to vest) at June 30, 2015, Weighted Average Exercise Price per Share 58.37  
Exercisable at June 30, 2015, Weighted Average Exercise Price per Share $ 60.97  
Outstanding (vested and expected to vest) at June 30, 2015, Weighted Average Remaining Contractual Term 8 years 4 months 24 days  
Exercisable at June 30, 2015, Weighted Average Remaining Contractual Term 7 years 3 months 18 days  
Outstanding (vested and expected to vest) at June 30, 2015, Aggregate Intrinsic Value $ 0  
Exercisable at June 30, 2015, Aggregate Intrinsic Value $ 0