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Accumulated Other Comprehensive Earnings - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Expense related to pension liability reclassified from accumulated other comprehensive earnings | $ 6,100,000 | $ 7,000,000.0 | $ 4,900,000
Income (expense) related to fair value of derivative investments reclassified from accumulated other comprehensive earnings | 6,300,000 | 5,200,000 | 5,700,000
Foreign currency translation reclassified from accumulated other comprehensive earnings | $ 0 | $ 0 | $ 0

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