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Employee Benefit Plans (Pension Benefit Plan) - Summary of Net Amounts Recognized Balance Sheet for the Unfunded Pension Liability (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Compensation And Retirement Disclosure [Abstract] |  |
Current liability | $ 0 | $ 0
Non-current liability | 13,078 | 8,269
Total | $ 13,078 | $ 8,269

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