Segments and Geographical Information Segments and Geographical Information - (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenue	[1]	$ 845,486	$ 761,653	$ 660,206
Gross profit		640,110	578,443	498,106
Invisalign Full [Member]
Segment Reporting Information [Line Items]
Revenue		800,186	712,549	614,649
Invisalign Express/Lite [Member]
Segment Reporting Information [Line Items]
Revenue		45,300	49,104	45,557
Clear Aligner
Segment Reporting Information [Line Items]
Gross profit		628,187	562,889	484,835
Scanners and CAD/CAM Services
Segment Reporting Information [Line Items]
Gross profit		$ 11,923	$ 15,554	$ 13,271

[1] 2 Long-lived assets are attributed to countries based on entity that owns the assets.