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Share-Based Compensation - Activity in Company's Plan (Detail) - Jun. 30, 2015 - 1999 Stock Option Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at January 1, 2015, Number of Shares 12,000
Granted, Number of Shares 0
Exercised, Number of Shares 0
Forfeited, Number of Shares 0
Outstanding (exercisable and vested) at June 30, 2015, Number of Shares 12,000
Outstanding at January 1, 2015, Weighted Average Exercise Price per Share $ 41.44
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 (exercisable and vested) at June 30, 2015, Weighted Average Exercise Price per Share $ 41.44
Outstanding (exercisable and vested), Weighted Average Remaining Contractual Term 2 years 3 months 18 days
Outstanding (exercisable and vested) Aggregate Intrinsic Value $ 14