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Summary of Goodwill by Reportable Segment (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Goodwill [Line Items]    
Goodwill $ 61,745 $ 99,236
Clear Aligner [Member]
   
Goodwill [Line Items]    
Goodwill 61,745 58,543
Scanners and CAD/CAM Services
   
Goodwill [Line Items]    
Goodwill $ 0 $ 40,693