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Pension and Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract] |  |  |
Defined benefit plan contributions | $ 0.1 | $ 0.2 |
Unfunded liability plans | $ 8.7 |  | $ 8.9

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