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Employee Benefit Plans (Details 3) - Pension Plan
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
market
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Expected long-term rates of return on plan assets for next year (as a percent) 5.90%        
Expected long-term rates of return on plan assets 6.00% 6.20% 6.70%    
U.S. Plans          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated benefit obligation       $ 286,000 $ 314,900
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]          
Projected benefit obligation       279,200 306,000
Accumulated benefit obligation       279,200 306,000
Fair value of plan assets       $ 196,600 219,200
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Number of capital market results simulated in the model for expected return on plan assets | market 1,000        
Period for which results of capital markets are simulated 20 years        
Expected long-term rates of return on plan assets for next year (as a percent) 7.30%        
Expected long-term rates of return on plan assets 7.30% 7.30% 7.30%    
Number of shares of Company's common stock included in plan assets | shares       450,000  
Value of shares of Company's common stock included in plan assets       $ 8,900 8,400
Fair values of plan assets $ 205,388 $ 205,271 $ 205,271 $ 205,388 $ 229,941
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 229,941 205,271      
Employer contributions 10,294 5,899      
Fair value of plan assets at end of year 205,388 229,941 $ 205,271    
U.S. Plans | Domestic equity securities          
Defined Benefit Plan, Information about Plan Assets [Abstract]          
Percentage of Plan Assets at December 31       30.60% 38.60%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 8,937 28,200   $ 8,937 $ 28,200
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 28,200        
Fair value of plan assets at end of year 8,937 28,200      
U.S. Plans | Domestic equity securities | Minimum          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       27.00%  
U.S. Plans | Domestic equity securities | Maximum          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       37.00%  
U.S. Plans | Domestic mutual funds—equities          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 54,002 60,785   $ 54,002 60,785
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 60,785        
Fair value of plan assets at end of year 54,002 60,785      
U.S. Plans | Common Stock, International [Member] [Member]          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 1,429 1,429     $ 1,429
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 1,429        
Fair value of plan assets at end of year   1,429      
U.S. Plans | International equity securities          
Defined Benefit Plan, Information about Plan Assets [Abstract]          
Percentage of Plan Assets at December 31       22.00% 24.50%
U.S. Plans | International equity securities | Minimum          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       20.00%  
U.S. Plans | International equity securities | Maximum          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       30.00%  
U.S. Plans | International equities—mutual funds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 45,195 54,879   $ 45,195 $ 54,879
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 54,879        
Fair value of plan assets at end of year 45,195 54,879      
U.S. Plans | Harsco common stock          
Defined Benefit Plan, Information about Plan Assets [Abstract]          
Percentage of Plan Assets at December 31       4.40% 3.70%
U.S. Plans | Fixed income securities          
Defined Benefit Plan, Information about Plan Assets [Abstract]          
Percentage of Plan Assets at December 31       42.90% 30.90%
U.S. Plans | Fixed income securities | Minimum          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       35.00%  
U.S. Plans | Fixed income securities | Maximum          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       45.00%  
U.S. Plans | U.S. Treasuries and collateralized securities          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 18,407 18,407     $ 18,407
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 18,407        
Fair value of plan assets at end of year   18,407      
U.S. Plans | Corporate bonds and notes          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 10,878 10,878     10,878
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 10,878        
Fair value of plan assets at end of year   10,878      
U.S. Plans | Mutual funds - bonds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 88,107 41,745   $ 88,107 $ 41,745
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 41,745        
Fair value of plan assets at end of year 88,107 41,745      
U.S. Plans | Other          
Defined Benefit Plan, Information about Plan Assets [Abstract]          
Percentage of Plan Assets at December 31       3.80% 5.00%
U.S. Plans | Other | Minimum          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       0.00%  
U.S. Plans | Other | Maximum          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       10.00%  
U.S. Plans | Other mutual funds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 7,703 11,336   $ 7,703 $ 11,336
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 11,336        
Fair value of plan assets at end of year 7,703 11,336      
U.S. Plans | Cash and cash equivalents          
Defined Benefit Plan, Information about Plan Assets [Abstract]          
Percentage of Plan Assets at December 31       0.70% 1.00%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 1,444 2,282   $ 1,444 $ 2,282
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 2,282        
Fair value of plan assets at end of year 1,444 2,282      
U.S. Plans | Cash and cash equivalents | Maximum          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       0.00%  
U.S. Plans | Level 1          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 205,388 132,250   $ 205,388 132,250
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 132,250        
Fair value of plan assets at end of year 205,388 132,250      
U.S. Plans | Level 1 | Domestic equity securities          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 8,937 28,200   8,937 28,200
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 28,200        
Fair value of plan assets at end of year 8,937 28,200      
U.S. Plans | Level 1 | Domestic mutual funds—equities          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 54,002 11,062   54,002 11,062
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 11,062        
Fair value of plan assets at end of year 54,002 11,062      
U.S. Plans | Level 1 | Common Stock, International [Member] [Member]          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 1,429 1,429     1,429
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 1,429        
Fair value of plan assets at end of year   1,429      
U.S. Plans | Level 1 | International equities—mutual funds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 45,195 54,879   45,195 54,879
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 54,879        
Fair value of plan assets at end of year 45,195 54,879      
U.S. Plans | Level 1 | U.S. Treasuries and collateralized securities          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 0     0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 0        
Fair value of plan assets at end of year   0      
U.S. Plans | Level 1 | Corporate bonds and notes          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 10,878 10,878     10,878
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 10,878        
Fair value of plan assets at end of year   10,878      
U.S. Plans | Level 1 | Mutual funds - bonds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 88,107 12,184   88,107 12,184
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 12,184        
Fair value of plan assets at end of year 88,107 12,184      
U.S. Plans | Level 1 | Other mutual funds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 7,703 11,336   7,703 11,336
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 11,336        
Fair value of plan assets at end of year 7,703 11,336      
U.S. Plans | Level 1 | Cash and cash equivalents          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 1,444 2,282   1,444 2,282
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 2,282        
Fair value of plan assets at end of year 1,444 2,282      
U.S. Plans | Level 2          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 97,691   0 97,691
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 97,691        
Fair value of plan assets at end of year 0 97,691      
U.S. Plans | Level 2 | Domestic equity securities          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 0        
Fair value of plan assets at end of year 0 0      
U.S. Plans | Level 2 | Domestic mutual funds—equities          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 49,723   0 49,723
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 49,723        
Fair value of plan assets at end of year 0 49,723      
U.S. Plans | Level 2 | Common Stock, International [Member] [Member]          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 0     0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 0        
Fair value of plan assets at end of year   0      
U.S. Plans | Level 2 | International equities—mutual funds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 0        
Fair value of plan assets at end of year 0 0      
U.S. Plans | Level 2 | U.S. Treasuries and collateralized securities          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 18,407 18,407     18,407
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 18,407        
Fair value of plan assets at end of year   18,407      
U.S. Plans | Level 2 | Corporate bonds and notes          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 0     0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 0        
Fair value of plan assets at end of year   0      
U.S. Plans | Level 2 | Mutual funds - bonds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 29,561   0 29,561
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 29,561        
Fair value of plan assets at end of year 0 29,561      
U.S. Plans | Level 2 | Other mutual funds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 0        
Fair value of plan assets at end of year 0 0      
U.S. Plans | Level 2 | Cash and cash equivalents          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 0        
Fair value of plan assets at end of year $ 0 $ 0      
International Plans          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated benefit obligation       869,400 1,010,600
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]          
Projected benefit obligation       831,700 986,600
Accumulated benefit obligation       828,900 981,900
Fair value of plan assets       701,400 812,000
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Expected long-term rates of return on plan assets for next year (as a percent) 5.50%        
Expected long-term rates of return on plan assets 5.60% 5.90% 6.50%    
Fair values of plan assets $ 842,717 $ 842,717 $ 732,743 $ 744,538 $ 842,717
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 842,717 732,743      
Employer contributions 18,415 18,187      
Fair value of plan assets at end of year $ 744,538 842,717 $ 732,743    
International Plans | United Kingdom          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Expected long-term rates of return on plan assets for next year (as a percent) 5.50%        
Pension plan assets as a percentage of international plan assets       94.00%  
International Plans | International, other than UK          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Pension plan assets as a percentage of international plan assets       6.00%  
International Plans | Equity Securities [Member]          
Defined Benefit Plan, Information about Plan Assets [Abstract]          
Percentage of Plan Assets at December 31       29.20% 31.50%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       29.00%  
International Plans | Mutual funds - equities          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets $ 217,321 265,989   $ 217,321 $ 265,989
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 265,989        
Fair value of plan assets at end of year 217,321 265,989      
International Plans | Fixed income securities          
Defined Benefit Plan, Information about Plan Assets [Abstract]          
Percentage of Plan Assets at December 31       50.70% 44.60%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       50.00%  
International Plans | Mutual funds - bonds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 372,094 369,291   $ 372,094 $ 369,291
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 369,291        
Fair value of plan assets at end of year 372,094 369,291      
International Plans | Insurance contracts          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 5,620 6,189   $ 5,620 $ 6,189
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 6,189        
Fair value of plan assets at end of year 5,620 6,189      
International Plans | Other          
Defined Benefit Plan, Information about Plan Assets [Abstract]          
Percentage of Plan Assets at December 31       19.80% 23.60%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       21.00%  
International Plans | Other mutual funds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 147,313 198,856   $ 147,313 $ 198,856
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 198,856        
Fair value of plan assets at end of year 147,313 198,856      
International Plans | Cash and cash equivalents          
Defined Benefit Plan, Information about Plan Assets [Abstract]          
Percentage of Plan Assets at December 31       0.30% 0.30%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)       0.00%  
Fair values of plan assets 2,190 2,392   $ 2,190 $ 2,392
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 2,392        
Fair value of plan assets at end of year 2,190 2,392      
International Plans | Level 1          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 2,190 2,392   2,190 2,392
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 2,392        
Fair value of plan assets at end of year 2,190 2,392      
International Plans | Level 1 | Mutual funds - equities          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 0        
Fair value of plan assets at end of year 0 0      
International Plans | Level 1 | Mutual funds - bonds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 0        
Fair value of plan assets at end of year 0 0      
International Plans | Level 1 | Insurance contracts          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0   0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year        
Fair value of plan assets at end of year 0      
International Plans | Level 1 | Other mutual funds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 0        
Fair value of plan assets at end of year 0 0      
International Plans | Level 1 | Cash and cash equivalents          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 2,190 2,392   2,190 2,392
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 2,392        
Fair value of plan assets at end of year 2,190 2,392      
International Plans | Level 2          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 742,348 840,325   742,348 840,325
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 840,325        
Fair value of plan assets at end of year 742,348 840,325      
International Plans | Level 2 | Mutual funds - equities          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 217,321 265,989   217,321 265,989
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 265,989        
Fair value of plan assets at end of year 217,321 265,989      
International Plans | Level 2 | Mutual funds - bonds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 372,094 369,291   372,094 369,291
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 369,291        
Fair value of plan assets at end of year 372,094 369,291      
International Plans | Level 2 | Insurance contracts          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 5,620 6,189   5,620 6,189
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 6,189        
Fair value of plan assets at end of year 5,620 6,189      
International Plans | Level 2 | Other mutual funds          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 147,313 198,856   147,313 198,856
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 198,856        
Fair value of plan assets at end of year 147,313 198,856      
International Plans | Level 2 | Cash and cash equivalents          
Defined Benefit Plan, Plan Assets, Allocations [Abstract]          
Fair values of plan assets 0 0   $ 0 $ 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair value of plan assets at beginning of year 0        
Fair value of plan assets at end of year $ 0 $ 0