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Summary of Unaudited Pro Forma Financial Information (Details) - World of Medicine GmbH and Laser Quantum
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenue | $ $ 562,818
Consolidated net income | $ $ 39,630
Earnings per share attributable to Novanta Inc. - Basic | $ / shares $ 0.49
Earnings per share attributable to Novanta Inc. - Diluted | $ / shares $ 0.49