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Retirement Plans - Defined Benefit, Funded Status of Plan (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
United States [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ (972)	$ (168,064)	$ (159,416)
Fair value of defined benefit plan assets		171,373	144,665
Funded status of defined benefit plan	(972)	3,309
United States [Member] | Retiree Healthcare Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	(17,724)	(17,121)	(14,921)
Fair value of defined benefit plan assets	11,080	11,125	9,142
Funded status of defined benefit plan	(6,644)	(5,996)
Non-U.S. Pension Plans [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	(93,722)	(96,378)	(85,311)
Fair value of defined benefit plan assets	81,587	74,990	$ 65,548
Funded status of defined benefit plan	$ (12,135)	$ (21,388)

X

- Definition

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

+ References

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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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