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Employee Benefit Plans (Details 3) - Pension Plan
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
market
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Expected long-term rates of return on plan assets for next year (as a percent) 5.10%    
Expected long-term rates of return on plan assets 5.70% 5.50% 4.70%
U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation $ 186,400 $ 209,200  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]      
Projected benefit obligation 13,000 209,200  
Accumulated benefit obligation 13,000 209,200  
Fair value of plan assets $ 0 $ 180,900  
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) 6.80%    
Expected long-term rates of return on plan assets 7.00% 7.00% 6.30%
Number of shares of Company's common stock included in plan assets | shares 310,000 310,000  
Fair values of plan assets $ 183,292 $ 180,927 $ 177,044
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 180,927 177,044  
Employer contributions 7,301 1,674  
Fair value of plan assets at end of year $ 183,292 $ 180,927 $ 177,044
U.S. Plans | Domestic equity securities      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Percentage of Plan Assets at December 31 8.80% 10.70%  
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets $ 2,388 $ 2,791  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 2,791    
Fair value of plan assets at end of year $ 2,388 2,791  
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) 4.00%    
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) 14.00%    
U.S. Plans | Domestic mutual funds—equities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets $ 13,748 16,583  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 16,583    
Fair value of plan assets at end of year $ 13,748 $ 16,583  
U.S. Plans | International equity securities      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Percentage of Plan Assets at December 31 21.00% 24.30%  
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) 17.00%    
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) 27.00%    
U.S. Plans | International equities—mutual funds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets $ 38,398 $ 43,994  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 43,994    
Fair value of plan assets at end of year $ 38,398 $ 43,994  
U.S. Plans | Harsco common stock      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Percentage of Plan Assets at December 31 1.30% 1.50%  
U.S. Plans | Fixed income securities      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Percentage of Plan Assets at December 31 65.40% 52.80%  
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) 61.00%    
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) 71.00%    
U.S. Plans | U.S. Treasuries and collateralized securities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets $ 15,673 $ 13,920  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 13,920    
Fair value of plan assets at end of year 15,673 13,920  
U.S. Plans | Mutual funds - bonds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 104,166 81,634  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 81,634    
Fair value of plan assets at end of year $ 104,166 $ 81,634  
U.S. Plans | Other      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Percentage of Plan Assets at December 31 3.90% 11.30%  
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) 8.00%    
U.S. Plans | Other mutual funds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets   $ 4,913  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year $ 4,913    
Fair value of plan assets at end of year   $ 4,913  
U.S. Plans | Cash and cash equivalents      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Percentage of Plan Assets at December 31 0.90% 0.90%  
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets $ 1,681 $ 1,661  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 1,661    
Fair value of plan assets at end of year $ 1,681 1,661  
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) 5.00%    
U.S. Plans | Partnership [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets $ 7,238 15,431  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 15,431    
Fair value of plan assets at end of year 7,238 15,431  
U.S. Plans | Defined Benefit Plan, Equity Securities, Common Stock, Employer, Related Party [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Value of shares of Company's common stock included in plan assets 2,400 2,800  
U.S. Plans | Level 1      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 160,381 151,576  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 151,576    
Fair value of plan assets at end of year 160,381 151,576  
U.S. Plans | Level 1 | Domestic equity securities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 2,388 2,791  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 2,791    
Fair value of plan assets at end of year 2,388 2,791  
U.S. Plans | Level 1 | Domestic mutual funds—equities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 13,748 16,583  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 16,583    
Fair value of plan assets at end of year 13,748 16,583  
U.S. Plans | Level 1 | International equities—mutual funds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 38,398 43,994  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 43,994    
Fair value of plan assets at end of year 38,398 43,994  
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  
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 1 | Mutual funds - bonds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 104,166 81,634  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 81,634    
Fair value of plan assets at end of year 104,166 81,634  
U.S. Plans | Level 1 | Other mutual funds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets   4,913  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 4,913    
Fair value of plan assets at end of year   4,913  
U.S. Plans | Level 1 | Cash and cash equivalents      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 1,681 1,661  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 1,661    
Fair value of plan assets at end of year 1,681 1,661  
U.S. Plans | Level 1 | Partnership [Member]      
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 0    
Fair value of plan assets at end of year 0 0  
U.S. Plans | Level 2      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 15,673 13,920  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 13,920    
Fair value of plan assets at end of year 15,673 13,920  
U.S. Plans | Level 2 | Domestic equity securities      
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 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 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 | International equities—mutual funds      
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 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 15,673 13,920  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 13,920    
Fair value of plan assets at end of year 15,673 13,920  
U.S. Plans | Level 2 | Mutual funds - bonds      
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 0    
Fair value of plan assets at end of year 0 0  
U.S. Plans | Level 2 | Other mutual funds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets   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 | Cash and cash equivalents      
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 0    
Fair value of plan assets at end of year 0 0  
U.S. Plans | Level 2 | Partnership [Member]      
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 0    
Fair value of plan assets at end of year 0 0  
U.S. Plans | Fair Value Measured at Net Asset Value Per Share [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 7,238 15,431  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 15,431    
Fair value of plan assets at end of year 7,238 15,431  
U.S. Plans | Fair Value Measured at Net Asset Value Per Share [Member] | Domestic equity securities      
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 0    
Fair value of plan assets at end of year 0 0  
U.S. Plans | Fair Value Measured at Net Asset Value Per Share [Member] | Domestic mutual funds—equities      
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 0    
Fair value of plan assets at end of year 0 0  
U.S. Plans | Fair Value Measured at Net Asset Value Per Share [Member] | International equities—mutual funds      
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 0    
Fair value of plan assets at end of year 0 0  
U.S. Plans | Fair Value Measured at Net Asset Value Per Share [Member] | U.S. Treasuries and collateralized securities      
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 0    
Fair value of plan assets at end of year 0 0  
U.S. Plans | Fair Value Measured at Net Asset Value Per Share [Member] | Mutual funds - bonds      
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 0    
Fair value of plan assets at end of year 0 0  
U.S. Plans | Fair Value Measured at Net Asset Value Per Share [Member] | Other mutual funds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets   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 | Fair Value Measured at Net Asset Value Per Share [Member] | Cash and cash equivalents      
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 0    
Fair value of plan assets at end of year 0 0  
U.S. Plans | Fair Value Measured at Net Asset Value Per Share [Member] | Partnership [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 7,238 15,431  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 15,431    
Fair value of plan assets at end of year 7,238 15,431  
International Plans      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 558,400 637,600  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]      
Projected benefit obligation 22,100 27,800  
Accumulated benefit obligation 19,900 24,100  
Fair value of plan assets $ 7,900 $ 9,700  
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Expected long-term rates of return on plan assets for next year (as a percent) 4.60%    
Expected long-term rates of return on plan assets 5.30% 5.10% 4.40%
Fair values of plan assets $ 611,667 $ 669,021 $ 608,672
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 669,021 608,672  
Employer contributions 14,778 24,715  
Fair value of plan assets at end of year $ 611,667 $ 669,021 $ 608,672
International Plans | Equity Securities [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Percentage of Plan Assets at December 31 0.90% 10.80%  
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Target Long-Term Allocation (less than 5% for Cash and cash equivalents) 12.40%    
International Plans | Mutual funds - equities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets $ 5,342 $ 71,980  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 71,980    
Fair value of plan assets at end of year $ 5,342 $ 71,980  
International Plans | Fixed income securities      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Percentage of Plan Assets at December 31 95.00% 83.30%  
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Target Long-Term Allocation (less than 5% for Cash and cash equivalents) 82.80%    
International Plans | Mutual funds - bonds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets $ 576,540 $ 552,898  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 552,898    
Fair value of plan assets at end of year 576,540 552,898  
International Plans | Insurance contracts      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 4,394 4,631  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 4,631    
Fair value of plan assets at end of year $ 4,394 $ 4,631  
International Plans | Other      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Percentage of Plan Assets at December 31 2.30% 5.40%  
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Target Long-Term Allocation (less than 5% for Cash and cash equivalents) 4.80%    
International Plans | Other mutual funds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets $ 14,244 $ 36,263  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 36,263    
Fair value of plan assets at end of year $ 14,244 $ 36,263  
International Plans | Cash and cash equivalents      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Percentage of Plan Assets at December 31 1.80% 0.50%  
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 $ 11,147 $ 3,249  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 3,249    
Fair value of plan assets at end of year 11,147 3,249  
International Plans | Level 1      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 11,147 3,249  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 3,249    
Fair value of plan assets at end of year 11,147 3,249  
International Plans | Level 1 | Mutual funds - equities      
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 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  
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 0    
Fair value of plan assets at end of year 0 0  
International Plans | Level 1 | Other mutual funds      
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 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 11,147 3,249  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 3,249    
Fair value of plan assets at end of year 11,147 3,249  
International Plans | Level 2      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 600,520 665,772  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 665,772    
Fair value of plan assets at end of year 600,520 665,772  
International Plans | Level 2 | Mutual funds - equities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 5,342 71,980  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 71,980    
Fair value of plan assets at end of year 5,342 71,980  
International Plans | Level 2 | Mutual funds - bonds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 576,540 552,898  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 552,898    
Fair value of plan assets at end of year 576,540 552,898  
International Plans | Level 2 | Insurance contracts      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 4,394 4,631  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 4,631    
Fair value of plan assets at end of year 4,394 4,631  
International Plans | Level 2 | Other mutual funds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Fair values of plan assets 14,244 36,263  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 36,263    
Fair value of plan assets at end of year 14,244 36,263  
International Plans | Level 2 | Cash and cash equivalents      
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 0    
Fair value of plan assets at end of year $ 0 $ 0  
International, Other Than United Kingdom [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Pension plan assets as a percentage of international plan assets 6.00%    
United Kingdom      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Expected long-term rates of return on plan assets for next year (as a percent) 4.60% 5.30%  
Pension plan assets as a percentage of international plan assets 94.00%