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Income Taxes - Summary Of Valuation Allowance (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Beginning Balance |  | $ 58,834 | $ 60,101 | $ 51,221
Charged to Provision for Income Taxes | [1] | (1,647) | 2,919 | 1,137
Other | [2] | (2,887) | (4,186) | 7,743
Ending Balance |  | $ 54,300 | $ 58,834 | $ 60,101
[1] | These amounts have been recorded as part of the income statement provision for income taxes. The income statement effects of these amounts have largely been offset by amounts related to changes in other deferred tax balance sheet accounts.
[2] | The changes in the valuation allowance during the years ended December 31, 2022 and 2021 are primarily due to the effect of foreign currency translation on a valuation allowance related to a net operating loss carryforward. The change in the valuation allowance during the year ended December 31, 2020 was primarily due to the effect of foreign currency translation on a valuation allowance related to a net operating loss carryforward and acquired historical net operating losses.

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- 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Valuation Allowance Deferred Tax Asset Change Others. + References No definition available. + Details
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Namespace Prefix: | wat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Valuation allowance deferred yax asset charged to income tax provision. + References No definition available. + Details
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Namespace Prefix: | wat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration