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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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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent.

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