Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items]
Provision for (benefit from) income taxes	$ 240,403	$ (1,396,939)	$ 112,347
Number of operating segments | segment	2
Fixed-income securities investment portfolio, maximum effective maturity	40 months
Foreign currency net gains (losses)	$ (13,300)	6,800	(2,000)
Revenue remaining performance obligation	1,307,300
Costs to obtain contracts	31,100	22,800
Amortization of costs to obtain contracts	17,000	10,100	7,200
Advertising cost	$ 325,600	161,000	$ 119,100
Intraoral Scanners
Significant Accounting Policies [Line Items]
Warranty period	1 year
CAD/CAM Software
Significant Accounting Policies [Line Items]
Warranty period	1 year
Invisalign | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Significant Accounting Policies [Line Items]
Expected timing (up to two years for Invisalign Go)	6 months
Invisalign | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Significant Accounting Policies [Line Items]
Expected timing (up to two years for Invisalign Go)	5 years
Invisalign Go | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Significant Accounting Policies [Line Items]
Expected timing (up to two years for Invisalign Go)	2 years
Systems and Services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Significant Accounting Policies [Line Items]
Expected timing (up to two years for Invisalign Go)	1 year
Systems and Services | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Significant Accounting Policies [Line Items]
Expected timing (up to two years for Invisalign Go)	5 years
Revision of Prior Period, Adjustment
Significant Accounting Policies [Line Items]
Provision for (benefit from) income taxes	$ (16,000)	$ (12,700)
Minimum
Significant Accounting Policies [Line Items]
Estimated useful lives of intangibles	1 year
Maximum
Significant Accounting Policies [Line Items]
Estimated useful lives of intangibles	15 years