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Commitments and Contingencies (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2019
USD ($)
Jan. 31, 2018
USD ($)
Apr. 30, 2017
Sep. 30, 2016
USD ($)
Sep. 30, 2019
USD ($)
subsidiary
claim
arrangement
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
subsidiary
claim
plaintiff
arrangement
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Litigation                      
Number of lawsuits filed | claim             1        
Number of injured individuals filing lawsuit | plaintiff             1        
Number of remaining unresolved claims | claim         2   2        
Charges related to potential liability for withdrawal from multi-employer pension plan         $ (45,000) $ 5,886,000 $ 489,000 $ 5,886,000      
Pension accrual         $ 3,064,000   3,064,000       $ 5,585,000
Dispute with Former Owner of Company's French Subsidiary | Settled Litigation | AGL Services Company v. Mistras Group | Affiliated Entity                      
Litigation                      
Litigation settlement, amount awarded to other party                   $ 400,000  
Defective Ultrasound Inspection System | Settled Litigation                      
Litigation                      
Amount of damages claimed       $ 2,300,000              
Defective Ultrasound Inspection System | Settled Litigation | Triumph Aerostructures-Vought Aircraft Division v. Mistras Group                      
Litigation                      
Litigation settlement, amount awarded to other party   $ 1,600,000                  
Litigation expenses                 $ 1,600,000    
Pension Related Contingencies                      
Litigation                      
Charges related to potential liability for withdrawal from multi-employer pension plan           5,900,000 $ 500,000        
Pension Related Contingencies | Pending Litigation                      
Litigation                      
Number of company's subsidiaries that could experience significant decline in employees covered by collective-bargaining arrangement | subsidiary         1   1        
Number of collective-bargaining agreements with significant decline in employees covered | arrangement         1   1        
Severance and Labor Disputes | Affiliated Entity | Germany | Selling, General and Administrative Expenses                      
Litigation                      
Estimated severance obligations         $ 1,100,000   $ 1,100,000        
Payments of severance obligations             200,000        
Reversal of severance obligations             200,000        
Severance and Labor Disputes | Pending Litigation | NDT Do Brazil, LTDA | Selling, General and Administrative Expenses                      
Litigation                      
Contingency charges           $ 1,200,000          
Severance and Labor Disputes | Pending Litigation | Affiliated Entity | Germany                      
Litigation                      
Temporary employment contract period     18 months                
Acquisition-related Contingencies                      
Litigation                      
Potential acquisition-related contingent consideration, low end of range         0   0        
Potential acquisition-related contingent consideration, high end of range         7,900,000   7,900,000        
Subsequent Event                      
Litigation                      
Payment to pension plan $ 900,000                    
Subsequent Event | Pension Related Contingencies                      
Litigation                      
Charges related to potential liability for withdrawal from multi-employer pension plan $ 900,000                    
Products and Systems | Foreign Subsidiaries | Disposal Group, Disposed of by Sale, Not Discontinued Operations                      
Litigation                      
Term of agreement to purchase products from the buyer on sale of subsidiary           3 years   3 years      
Amount of purchased commitment to buy products from the buyer on sale of subsidiary           $ 2,300,000   $ 2,300,000      
Remaining balance under purchase commitment agreement         $ 1,600,000   $ 1,600,000