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Share-Based Compensation - Activity in Company's Plan (Detail) - 1999 Stock Option Plan [Member]
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at January 1, 2016, Number of Shares | shares 12,000
Granted, Number of Shares | shares 0
Exercised, Number of Shares | shares 0
Forfeited, Number of Shares | shares 0
Outstanding (exercisable and vested) at June 30, 2016, Number of Shares | shares 12,000
Outstanding at January 1, 2016, Weighted Average Exercise Price per Share | $ / shares $ 41.44
Granted, Weighted Average Exercise Price per Share | $ / shares 0.00
Exercised, Weighted Average Exercise Price per Share | $ / shares 0.00
Forfeited, Weighted Average Exercise Price per Share | $ / shares 0.00
Outstanding (exercisable and vested) at June 30, 2016, Weighted Average Exercise Price per Share | $ / shares $ 41.44
Outstanding (exercisable and vested), Weighted Average Remaining Contractual Term 1 year 3 months 18 days
Outstanding (exercisable and vested) Aggregate Intrinsic Value | $ $ 33