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Business Combinations - Additional Information (Details)
£ in Millions
6 Months Ended
Jan. 10, 2017
USD ($)
Jan. 10, 2017
GBP (£)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]        
Goodwill     $ 151,538,000 $ 108,128,000
Pre-tax gain on excess fair value of equity interest held     26,409,000  
Thing Magic        
Business Acquisition [Line Items]        
Total purchase price $ 19,089,000      
Intangible assets 7,423,000      
Goodwill 9,929,000      
Revenues     4,200,000  
Income (loss) from continuing operations before income taxes     (100,000)  
Amortization of inventory fair value adjustments and purchased intangible assets, included in operating income (loss)     $ 900,000  
Thing Magic | Maximum        
Business Acquisition [Line Items]        
Estimated fair value measurement period from acquisition date     1 year  
Laser Quantum        
Business Acquisition [Line Items]        
Total purchase price 15,709,000      
Intangible assets 38,955,000      
Goodwill $ 31,459,000      
Revenues     $ 18,600,000  
Income (loss) from continuing operations before income taxes     3,000,000  
Amortization of inventory fair value adjustments and purchased intangible assets, included in operating income (loss)     $ 4,100,000  
Percentage of additional shares acquired 35.00%      
Total purchase price paid by Novanta $ 31,052,000 £ 25.5    
Percentage of equity interest held before acquisition 41.00%     41.00%
Percentage of equity interest held after acquisition 76.00%      
Option to purchase and sell remaining shareholders shares, year     2020  
Pre-tax gain on excess fair value of equity interest held     $ 26,400,000  
Equity method investment ownership percentage on Laser Quantum 41.00% 41.00%    
Non controlling interest held by remaining shareholders 24.00%      
Goodwill assets expected to be deductible for tax purposes $ 0      
Laser Quantum | Maximum        
Business Acquisition [Line Items]        
Estimated fair value measurement period from acquisition date     1 year  
Revolving Credit Facility | Thing Magic        
Business Acquisition [Line Items]        
Amount draw-down to finance acquisition 12,000,000      
Revolving Credit Facility | Laser Quantum        
Business Acquisition [Line Items]        
Amount draw-down to finance acquisition $ 30,000,000