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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, 2019	Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Current liability	$ 0	$ 0
Pension liability	15,886	13,086
Total	$ 15,886	$ 13,086

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan. Excludes other postretirement benefit plan.

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as current. Excludes other postretirement benefit plan.

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

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