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Segments and Geographical Information Segments and Geographical Information - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net revenues	$ 1,966,492	$ 1,473,413	$ 1,079,874
Gross profit	1,447,867	1,116,947	815,294
Operating Income (Loss)	466,564	353,611	248,921
Depreciation and amortization	54,727	37,739	24,002
Clear Aligner
Segment Reporting Information [Line Items]
Net revenues	1,691,467	1,309,262	958,327
Scanner and Services
Segment Reporting Information [Line Items]
Net revenues	275,025	164,151	121,547
Clear Aligner
Segment Reporting Information [Line Items]
Gross profit	1,280,495	1,019,563	747,494
Operating Income (Loss)	712,439	564,648	411,817
Depreciation and amortization	29,001	21,581	13,742
Scanners And Services
Segment Reporting Information [Line Items]
Gross profit	167,372	97,384	67,800
Operating Income (Loss)	98,998	49,613	37,498
Depreciation and amortization	4,965	4,385	3,871
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Operating Income (Loss)	(344,873)	(260,650)	(200,394)
Depreciation and amortization	$ 20,761	$ 11,773	$ 6,389

X

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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