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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
Compensation And Retirement Disclosure [Abstract]    
Current liability $ 0 $ 0
Non-current liability 13,078 8,269
Total $ 13,078 $ 8,269