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Income Taxes - Summary Of Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Beginning Balance	$ 53,893	$ 62,098	$ 61,225
Charged to Provision for Income Taxes	(1,242)	(2,128)	(6,363)
Other	(1,430)	(6,077)	7,236
Ending Balance	$ 51,221	$ 53,893	$ 62,098

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Valuation Allowance Deferred Tax Asset Change Others.

+ References

No definition available.

+ Details

Name:	wat_ValuationAllowanceDeferredTaxAssetChangeOthers
Namespace Prefix:	wat_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Valuation allowance deferred yax asset charged to income tax provision.

+ References

No definition available.

+ Details

Name:	wat_ValuationAllowanceDeferredTaxAssetChargedToIncomeTaxProvision
Namespace Prefix:	wat_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration