Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenue	$ 164,506	[1]	$ 136,496	[1]	$ 481,914	[1]	$ 417,201	[1]
Gross profit	125,090		100,350		361,630		309,910
Invisalign Full [Member]
Segment Reporting Information [Line Items]
Revenue	93,945		80,294		275,621		251,335
Clear Aligner [Member]
Segment Reporting Information [Line Items]
Gross profit	122,663		98,334		352,114		301,340
Scanners and CAD/CAM Services
Segment Reporting Information [Line Items]
Gross profit	2,427		2,016		9,516		8,570
Invisalign ExpressLite [Member]
Segment Reporting Information [Line Items]
Revenue	17,702		12,779		52,943		38,217
Invisalign Teen [Member]
Segment Reporting Information [Line Items]
Revenue	23,779		19,144		62,289		50,672
Invisalign Assist [Member]
Segment Reporting Information [Line Items]
Revenue	7,445		7,051		23,418		21,495
Invisalign Non-Case Revenues [Member]
Segment Reporting Information [Line Items]
Revenue	10,679		7,457		34,154		22,003
Scanners [Member]
Segment Reporting Information [Line Items]
Revenue	5,538		4,023		17,190		15,416
CADCAM Services [Member]
Segment Reporting Information [Line Items]
Revenue	$ 5,418		$ 5,748		$ 16,299		$ 18,063

[1] .