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Unaudited Quarterly Results - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Data [Line Items]
Litigation (settlement) provisions	$ (322)	$ (924)	$ 1,672		$ 426	$ (11,114)
Waters Retirement Plan [Member]
Quarterly Financial Data [Line Items]
Defined benefit plan, settlement charge	46,000			$ 46,000
Defined benefit plan, settlement charge, cash contribution	6,000			6,000
Defined benefit plan, settlement charge, non-cash	$ 40,000			$ 40,000

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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Quarterly financial data.

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