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Retirement Plans - Defined Benefit, Funded Status of Plan (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
United States [Member] | Pension Plans [Member]
Projected benefit obligation			$ (972)
United States [Member] | Retiree Healthcare Plan [Member]
Projected benefit obligation	$ (25,369)	$ (21,186)	(17,724)
Fair value of plan assets	16,168	13,773	11,080
Funded status	(9,201)	(7,413)
Non-U.S. Pension Plans [Member] | Pension Plans [Member]
Projected benefit obligation	(119,590)	(103,366)	(93,722)
Fair value of plan assets	93,890	83,011	$ 81,587
Funded status	$ (25,700)	$ (20,355)

X

- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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