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Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ (159)	$ 208	$ (247)	$ 466
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1,640	1,566	4,962	4,645
Expected return on plan assets	(2,365)	(2,320)	(7,087)	(6,962)
Amortization of net actuarial loss	563	987	1,867	2,860
Net periodic benefit cost	(162)	233	(258)	543
United Kingdom [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	134	138	416	430
Expected return on plan assets	(190)	(216)	(589)	(673)
Amortization of net actuarial loss	59	53	184	166
Net periodic benefit cost	$ 3	$ (25)	$ 11	$ (77)

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

+ References

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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