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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, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding at January 1, 2019, Number of Shares 30,750  
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 31,2019, Number of Shares 30,750  
Exercisable at March 31, 2019, Number of Shares 23,250  
Outstanding at January 1, 2019, Weighted Average Exercise Price per Share $ 56.81  
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 31,2019, Weighted Average Exercise Price per Share 56.81  
Exercisable at March 31,2019, Weighted Average Exercise Price per Share $ 56.77  
Outstanding (vested and expected to vest) at March 31, 2019, Weighted Average Remaining Contractual Term 6 years 8 months 12 days  
Exercisable at March 31,2019, Weighted Average Remaining Contractual Term 5 years 9 months 18 days  
Outstanding (vested and expected to vest) at March 31, 2019, Aggregate Intrinsic Value $ 112  
Exercisable at March 31, 2019, Aggregate Intrinsic Value $ 100