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Commitments and Contingencies (Details)
1 Months Ended 3 Months Ended 6 Months Ended 10 Months Ended 12 Months Ended
Jan. 31, 2018
USD ($)
Sep. 30, 2016
USD ($)
Apr. 30, 2015
claim
Jun. 30, 2016
USD ($)
Jun. 30, 2018
USD ($)
subsidiary
arrangement
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Litigation              
Number of Company's subsidiaries that could experience significant decline in employees covered by collective-bargaining arrangement | subsidiary         1    
Number of collective-bargaining agreements with significant decline in employees covered | arrangement         1    
Triumph Aerostructures-Vought Aircraft Division v. Mistras Group              
Litigation              
Litigation settlement, amount awarded to other party $ 1,600,000            
Consolidated class and collective action lawsuit | Settled Litigation              
Litigation              
Number of consolidated claims settled | claim     2        
Settlement charge       $ 6,300,000      
Dispute with former owner of company's French subsidiary | Affiliated Entity | AGL Services Company v. Mistras Group              
Litigation              
Litigation settlement, amount awarded to other party           $ 400,000  
Defective ultrasound inspection system | Triumph Aerostructures-Vought Aircraft Division v. Mistras Group | Ultrasonic Inspection System              
Litigation              
Settlement charge             $ 1,600,000
Defective ultrasound inspection system | Pending Litigation              
Litigation              
Amount of damages claimed   $ 2,300,000          
Acquisition-related contingencies              
Litigation              
Potential acquisition-related contingent consideration, low end of range         $ 0    
Potential acquisition-related contingent consideration, high end of range         $ 6,700,000    
Remaining period over which potential acquisition-related contingent consideration would be payable         2 years