XML 131 R77.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Employee Benefit Plans (Details 3) - Pension Plan $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) market | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Expected long-term rates of return on plan assets for next year (as a percent) | 5.60% |  |  |  |
Expected long-term rates of return on plan assets | 5.90% | 6.00% | 6.20% |  |
International, Other Than United Kingdom [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Pension plan assets as a percentage of international plan assets |  |  |  | 5.00% |
U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation |  |  |  | $ 294,700 | $ 286,000
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |  |  |
Projected benefit obligation |  |  |  | 294,700 | 279,200
Accumulated benefit obligation |  |  |  | 294,700 | 279,200
Fair value of plan assets |  |  |  | $ 226,300 | $ 196,600
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) | 7.00% |  |  |  |
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 |  |  |  | 360,000 | 450,000
Value of shares of Company's common stock included in plan assets |  |  |  | $ 8,300 | $ 8,900
Fair values of plan assets | $ 205,388 | $ 205,388 | $ 229,941 | $ 226,268 | $ 205,388
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 205,388 | 229,941 |  |  |
Employer contributions | 8,306 | 10,294 |  |  |
Fair value of plan assets at end of year | 226,268 | 205,388 | $ 229,941 |  |
U.S. Plans | Domestic equity securities |  |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |  |
Percentage of Plan Assets at December 31 |  |  |  | 30.80% | 30.60%
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 8,937 | 8,937 |  | $ 8,285 | $ 8,937
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 8,937 |  |  |  |
Fair value of plan assets at end of year | 8,285 | 8,937 |  |  |
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 | 54,002 |  | $ 61,346 | $ 54,002
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 54,002 |  |  |  |
Fair value of plan assets at end of year | 61,346 | 54,002 |  |  |
U.S. Plans | International equity securities |  |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |  |
Percentage of Plan Assets at December 31 |  |  |  | 25.30% | 22.00%
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 | 45,195 |  | $ 57,188 | $ 45,195
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 45,195 |  |  |  |
Fair value of plan assets at end of year | 57,188 | 45,195 |  |  |
U.S. Plans | Harsco common stock |  |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |  |
Percentage of Plan Assets at December 31 |  |  |  | 3.70% | 4.40%
U.S. Plans | Fixed income securities |  |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |  |
Percentage of Plan Assets at December 31 |  |  |  | 34.80% | 42.90%
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 | Mutual funds - bonds |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 88,107 | 88,107 |  | $ 78,685 | $ 88,107
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 88,107 |  |  |  |
Fair value of plan assets at end of year | 78,685 | 88,107 |  |  |
U.S. Plans | Other |  |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |  |
Percentage of Plan Assets at December 31 |  |  |  | 8.30% | 3.80%
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 | 7,703 |  | $ 8,764 | $ 7,703
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 7,703 |  |  |  |
Fair value of plan assets at end of year | 8,764 | 7,703 |  |  |
U.S. Plans | Cash and cash equivalents |  |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |  |
Percentage of Plan Assets at December 31 |  |  |  | 0.80% | 0.70%
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 1,444 | 1,444 |  | $ 1,816 | $ 1,444
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 1,444 |  |  |  |
Fair value of plan assets at end of year | 1,816 | 1,444 |  |  |
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 | Partnership [Member] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 10,184 |  |  | $ 10,184 |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at end of year | 10,184 |  |  |  |
U.S. Plans | Level 1 |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 205,388 | 205,388 |  | 216,084 | 205,388
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 205,388 |  |  |  |
Fair value of plan assets at end of year | 216,084 | 205,388 |  |  |
U.S. Plans | Level 1 | Domestic equity securities |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 8,937 | 8,937 |  | 8,285 | 8,937
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 8,937 |  |  |  |
Fair value of plan assets at end of year | 8,285 | 8,937 |  |  |
U.S. Plans | Level 1 | Domestic mutual funds—equities |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 54,002 | 54,002 |  | 61,346 | 54,002
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 54,002 |  |  |  |
Fair value of plan assets at end of year | 61,346 | 54,002 |  |  |
U.S. Plans | Level 1 | International equities—mutual funds |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 45,195 | 45,195 |  | 57,188 | 45,195
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 45,195 |  |  |  |
Fair value of plan assets at end of year | 57,188 | 45,195 |  |  |
U.S. Plans | Level 1 | Mutual funds - bonds |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 88,107 | 88,107 |  | 78,685 | 88,107
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 88,107 |  |  |  |
Fair value of plan assets at end of year | 78,685 | 88,107 |  |  |
U.S. Plans | Level 1 | Other mutual funds |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 7,703 | 7,703 |  | 8,764 | 7,703
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 7,703 |  |  |  |
Fair value of plan assets at end of year | 8,764 | 7,703 |  |  |
U.S. Plans | Level 1 | Cash and cash equivalents |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 1,444 | 1,444 |  | 1,816 | 1,444
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 1,444 |  |  |  |
Fair value of plan assets at end of year | 1,816 | $ 1,444 |  |  |
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 end of year | 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 | 10,184 |  |  | 10,184 |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at end of year | 10,184 |  |  |  |
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 | 10,184 |  |  | 10,184 |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at end of year | $ 10,184 |  |  |  |
International Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation |  |  |  | 982,700 | 869,400
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |  |  |
Projected benefit obligation |  |  |  | 966,300 | 831,700
Accumulated benefit obligation |  |  |  | 961,100 | 828,900
Fair value of plan assets |  |  |  | 841,900 | 701,400
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Expected long-term rates of return on plan assets for next year (as a percent) | 5.20% |  |  |  |
Expected long-term rates of return on plan assets | 5.50% | 5.60% | 5.90% |  |
Fair values of plan assets | $ 864,636 | $ 842,717 | $ 842,717 | $ 864,636 | $ 744,538
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 744,538 | 842,717 |  |  |
Employer contributions | 21,121 | 18,415 |  |  |
Fair value of plan assets at end of year | 864,636 | 744,538 | $ 842,717 |  |
International Plans | Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |  |
Percentage of Plan Assets at December 31 |  |  |  | 31.60% | 29.20%
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 | 217,321 |  | $ 273,568 | $ 217,321
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 217,321 |  |  |  |
Fair value of plan assets at end of year | 273,568 | 217,321 |  |  |
International Plans | Fixed income securities |  |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |  |
Percentage of Plan Assets at December 31 |  |  |  | 48.50% | 50.70%
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 | 372,094 |  | $ 413,249 | $ 372,094
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 372,094 |  |  |  |
Fair value of plan assets at end of year | 413,249 | 372,094 |  |  |
International Plans | Insurance contracts |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 5,620 | 5,620 |  | $ 5,705 | $ 5,620
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 5,620 |  |  |  |
Fair value of plan assets at end of year | 5,705 | 5,620 |  |  |
International Plans | Other |  |  |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |  |  |
Percentage of Plan Assets at December 31 |  |  |  | 19.60% | 19.80%
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 | 147,313 |  | $ 169,886 | $ 147,313
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 147,313 |  |  |  |
Fair value of plan assets at end of year | 169,886 | 147,313 |  |  |
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 | 2,190 |  | $ 2,228 | $ 2,190
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 2,190 |  |  |  |
Fair value of plan assets at end of year | 2,228 | 2,190 |  |  |
International Plans | Level 1 |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 2,190 | 2,190 |  | 2,228 | 2,190
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 2,190 |  |  |  |
Fair value of plan assets at end of year | 2,228 | 2,190 |  |  |
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 |
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 | 2,190 |  | 2,228 | 2,190
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 2,190 |  |  |  |
Fair value of plan assets at end of year | 2,228 | 2,190 |  |  |
International Plans | Level 2 |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 742,348 | 742,348 |  | 862,408 | 742,348
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 742,348 |  |  |  |
Fair value of plan assets at end of year | 862,408 | 742,348 |  |  |
International Plans | Level 2 | Mutual funds - equities |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 217,321 | 217,321 |  | 273,568 | 217,321
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 217,321 |  |  |  |
Fair value of plan assets at end of year | 273,568 | 217,321 |  |  |
International Plans | Level 2 | Mutual funds - bonds |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 372,094 | 372,094 |  | 413,249 | 372,094
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 372,094 |  |  |  |
Fair value of plan assets at end of year | 413,249 | 372,094 |  |  |
International Plans | Level 2 | Insurance contracts |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 5,620 | 5,620 |  | 5,705 | 5,620
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 5,620 |  |  |  |
Fair value of plan assets at end of year | 5,705 | 5,620 |  |  |
International Plans | Level 2 | Other mutual funds |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Fair values of plan assets | 147,313 | 147,313 |  | 169,886 | 147,313
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets at beginning of year | 147,313 |  |  |  |
Fair value of plan assets at end of year | 169,886 | 147,313 |  |  |
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 |  |  |
United Kingdom |  |  |  |  |
Defined Benefit Plan, Plan Assets, Allocations [Abstract] |  |  |  |  |
Expected long-term rates of return on plan assets for next year (as a percent) | 5.20% | 5.50% |  |  |
Pension plan assets as a percentage of international plan assets |  |  |  | 95.00% |

X
- Definition Represents the plan assets as a percentage of total international plan assets. + References No definition available. + Details
Name: | hsc_DefinedBenefitPlanAssetsAsPercentageOfForeignPlanAssets
Namespace Prefix: | hsc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition An assumption for the next fiscal year as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
Name: | hsc_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssetsForNextFiscalYear
Namespace Prefix: | hsc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of capital market results simulated in the model to calculate the expected long-term return on plan assets. + References No definition available. + Details
Name: | hsc_DefinedBenefitPlanExpectedLongTermReturnOnPlanAssetsNumberOfCapitalMarketResultsSimulated
Namespace Prefix: | hsc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period for which results of capital markets are simulated in the model to calculate the expected long-term return on plan assets. + References No definition available. + Details
Name: | hsc_DefinedBenefitPlanExpectedLongTermReturnOnPlanAssetsPeriodForWhichResultsOfCapitalMarketsSimulated
Namespace Prefix: | hsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of employer security in which defined benefit plan asset is invested. Includes, but is not limited to, security issued or managed by related party of employer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (n) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
Name: | us-gaap_DefinedBenefitPlanAmountOfEmployerAndRelatedPartySecuritiesIncludedInPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanAssetsTargetAllocationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanInformationAboutPlanAssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares of employer stock in which defined benefit plan asset is invested. Includes, but is not limited to, stock issued or managed by related party of employer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (n) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanNumberOfSharesOfEquitySecuritiesIssuedByEmployerAndRelatedPartiesIncludedInPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
Name: | us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=hsc_InternationalOtherThanUnitedKingdomMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hsc_EquitySecuritiesDomesticMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hsc_EquityFundsDomesticMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hsc_EquitySecuritiesInternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hsc_EquityFundsInternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hsc_CompanysOwnCommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hsc_OtherAssetCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hsc_OtherAssetCategoriesMutualFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_PartnershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquityFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=hsc_InsuranceContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |