Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 198,086	[1]	$ 180,646	[1]
Gross profit	151,090		137,251
Clear Aligner [Member]
Segment Reporting Information [Line Items]
Gross profit	147,960		133,083
Invisalign Full [Member]
Segment Reporting Information [Line Items]
Revenue	187,029		168,239
Scanners and CAD/CAM Services
Segment Reporting Information [Line Items]
Revenue	11,057		12,407
Gross profit	$ 3,130		$ 4,168

[1] Net revenues are attributed to countries based on location of where revenue is recognized.