Segments and Geographical Information - Segments Information - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net revenues	$ 3,952,584	$ 2,471,941	$ 2,406,796
Gross profit	2,935,355	1,763,235	1,743,897
Operating Income (Loss)	976,400	387,171	542,493
Stock-based compensation	114,336	98,427	88,184
Depreciation and amortization	108,729	93,538	78,990
Impairments and other charges (gains), net	0	0	22,990
Litigation settlement gain	0	0	(51,000)
Operating Segments
Segment Reporting Information [Line Items]
Operating Income (Loss)	1,584,993	864,097	973,677
Unallocated corporate expense
Segment Reporting Information [Line Items]
Operating Income (Loss)	(608,593)	(476,926)	(431,184)
Stock-based compensation	102,983	88,718	78,709
Depreciation and amortization	36,425	35,369	32,570
Clear Aligner
Segment Reporting Information [Line Items]
Net revenues	3,247,080	2,101,459	2,025,750
Gross profit	2,474,373	1,532,130	1,499,713
Impairments and other charges (gains), net	0	0	22,990
Litigation settlement gain	0	0	(51,000)
Clear Aligner | Operating Segments
Segment Reporting Information [Line Items]
Operating Income (Loss)	1,325,866	768,045	835,957
Stock-based compensation	10,648	8,975	9,220
Depreciation and amortization	50,723	41,371	38,979
Systems and Services
Segment Reporting Information [Line Items]
Net revenues	705,504	370,482	381,046
Gross profit	460,982	231,105	244,184
Systems and Services | Operating Segments
Segment Reporting Information [Line Items]
Operating Income (Loss)	259,127	96,052	137,720
Stock-based compensation	705	734	255
Depreciation and amortization	$ 21,581	$ 16,798	$ 7,441