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Retirement Plans and Other Postretirement Benefits - Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets (Detail) - Pension Plan - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
U.S. Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation Exceeds Fair Value of Assets, Projected Benefit Obligation	$ 6,842	$ 7,119
Projected Benefit Obligation Exceeds Fair Value of Assets, Fair Value of Plan Assets	1,155	958
Accumulated Benefit Obligation Exceeds Fair Value of Assets, Projected Benefit Obligation	6,842	7,119
Accumulated Benefit Obligation Exceeds Fair Value of Assets, Fair Value of Plan Assets	1,155	958
Foreign Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Obligation Exceeds Fair Value of Assets, Projected Benefit Obligation	349,762	311,783
Projected Benefit Obligation Exceeds Fair Value of Assets, Fair Value of Plan Assets	248,914	224,347
Accumulated Benefit Obligation Exceeds Fair Value of Assets, Projected Benefit Obligation	347,267	309,990
Accumulated Benefit Obligation Exceeds Fair Value of Assets, Fair Value of Plan Assets	$ 248,914	$ 224,347

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Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920

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Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
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-Publisher FASB
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-Publisher FASB
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Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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