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Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
UNITED STATES |  |
Defined Benefit Plan Disclosure |  |
Deferred taxes related to prior service cost recognized in other comprehensive income | $ 560 | $ 560
Foreign Pension Plans, Defined Benefit |  |
Defined Benefit Plan Disclosure |  |
Deferred taxes related to prior service cost recognized in other comprehensive income | 0 |
Postretirement Benefit Plans |  |
Defined Benefit Plan Disclosure |  |
Prior service cost, before tax | (49) | (58)
Deferred taxes | (1,686) | (1,684)
Deferred taxes related to prior service cost recognized in other comprehensive income | $ (1,735) | $ (1,742)

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