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v3.20.1

Segments and Geographical Information - Additional Information (Details) | 3 Months Ended
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Mar. 31, 2020 segment
Disclosure Segments And Geographical Information Additional Information [Abstract] |
Number of reportable segments | 2

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- Definition Disclosure - Segments and Geographical Information - Additional Information [Abstract] + References No definition available. + Details
Name: | algn_DisclosureSegmentsAndGeographicalInformationAdditionalInformationAbstract
Namespace Prefix: | algn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration