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Balance Sheet Components - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Scanners, Warranty period	1 year

X

- Definition

Standard Product Warranty Time Period

+ References

No definition available.

+ Details

Name:	algn_StandardProductWarrantyTimePeriod
Namespace Prefix:	algn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_BalanceSheetRelatedDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration