Change in Carrying Value of Goodwill (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Clear Aligner [Member]
Goodwill [Roll Forward]
Balance as of December 31, 2013	$ 84,388	$ 85,362	$ 61,623
Adjustments 1			128
Balance as of March 31, 2014	$ 84,388	$ 85,362	$ 61,751