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Stock Plans (Details 2)
$ / shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 15, 2005
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense | $ $ 12,285 $ 11,493 $ 9,258  
Employee Stock Ownership Program [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 6,900,000      
Barnes Group Stock And Incentive Award Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock, Capital Shares Reserved for Future Issuance 6,913,978      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 5,700,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 5,628,950      
Other Incentive Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Issuance Ratio 2.84      
Non Employee Director Deferred Stock Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock, Capital Shares Reserved for Future Issuance 36,000      
Award vesting period 3 years      
Number of Common Shares Awarded, Non Employee Directors       12,000
Dividend Equivalent Paid To Non Employee Director Deferred Stock Plan | $ / shares $ 20 $ 21 $ 26  
Allocated Share-based Compensation Expense | $ $ 9 $ 28 $ 16  
Value Of Restricted Stock Units Granted | $ / shares $ 50      
All Stock Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock, Capital Shares Reserved for Future Issuance 7,166,895      
Stock Options and Rights [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Issuance Ratio 1      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,224,275      
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 5 years      
Maximum [Member] | Stock Rights [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 5 years