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Other Non-Current Liabilities - Statement of Composition of Other Non Current Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Other Liabilities Disclosure [Abstract] |  |
Deferred revenue | $ 11,276 | $ 891
Environmental and legal matters | 17,921 | 12,023
Deferred compensation liability | 51,508 | 49,835
Pension liability | 17,229 | 19,407
Other non-current liabilities | 16,359 | 14,024
Total other non-current liabilities | $ 114,293 | $ 96,180

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