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Leases - Additional information (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items] |
Operating leases that have not yet commenced | $ 17.8
Minimum |
Lessee, Lease, Description [Line Items] |
Term of operating leases not yet commenced | 2 years
Maximum |
Lessee, Lease, Description [Line Items] |
Term of operating leases not yet commenced | 7 years

X
- Definition Lessee, Lease Not Yet Commenced, Amount + References No definition available. + Details
Name: | algn_LesseeLeaseNotYetCommencedAmount
Namespace Prefix: | algn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee, Lease Not Yet Commenced, Term Of Contract + References No definition available. + Details
Name: | algn_LesseeLeaseNotYetCommencedTermOfContract
Namespace Prefix: | algn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |