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v3.20.2

Components of Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jan. 01, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  | $ 0
Components of Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |
Beginning balance | $ 758,870 | $ 789,659 | $ 335,272 | $ 313,376 | $ 789,659 | $ 313,376 |
Other comprehensive income (loss) before reclassifications |  |  |  |  | (43,044) | (901) |
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  | 26,073 | 9,030 |
Total other comprehensive income | 13,031 | (30,002) | 3,598 | 4,531 | (16,971) | 8,129 |
Other comprehensive income attributable to noncontrolling interests |  |  |  |  | 975 | 178 |
Other comprehensive income (loss) attributable to Harsco Corporation |  |  |  |  | (15,996) | 8,307 |
Ending balance | 764,516 | 758,870 | 349,114 | 335,272 | 764,516 | 349,114 |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |
Components of Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | (143,340) |  | (159,810) | (143,340) | (159,810) |
Other comprehensive income (loss) before reclassifications |  |  |  |  | (65,677) | 2,775 |
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  | 12,906 | (2,271) |
Total other comprehensive income |  |  |  |  | (52,771) | 504 |
Other comprehensive income attributable to noncontrolling interests |  |  |  |  | 975 | 178 |
Other comprehensive income (loss) attributable to Harsco Corporation |  |  |  |  | (51,796) | 682 |
Ending balance | (195,136) |  | (159,128) |  | (195,136) | (159,128) |
Effective Portion of Deriviatives Designated as Hedging Instruments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  | 0
Components of Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | (3,717) |  | 1,389 | (3,717) | 1,389 |
Other comprehensive income (loss) before reclassifications |  |  |  |  | (1,146) | (5,893) |
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  | (213) | 1,722 |
Total other comprehensive income |  |  |  |  | (1,359) | (4,171) |
Other comprehensive income attributable to noncontrolling interests |  |  |  |  | 0 | 0 |
Other comprehensive income (loss) attributable to Harsco Corporation |  |  |  |  | (1,359) | (4,171) |
Ending balance | (5,076) |  | (2,782) |  | (5,076) | (2,782) |
Cumulative Unrecognized Actuarial Losses on Pension Obligations |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  | (21,429)
Components of Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | (440,562) |  | (408,655) | (440,562) | (408,655) |
Other comprehensive income (loss) before reclassifications |  |  |  |  | 23,810 | 2,192 |
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  | 13,380 | 9,579 |
Total other comprehensive income |  |  |  |  | 37,190 | 11,771 |
Other comprehensive income attributable to noncontrolling interests |  |  |  |  | 0 | 0 |
Other comprehensive income (loss) attributable to Harsco Corporation |  |  |  |  | 37,190 | 11,771 |
Ending balance | (403,372) |  | (418,313) |  | (403,372) | (418,313) |
Unrealized Loss on Marketable Securities |  |  |  |  |  |  |
Components of Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |
Beginning balance |  | (3) |  | (31) | (3) | (31) |
Other comprehensive income (loss) before reclassifications |  |  |  |  | (31) | 25 |
Amounts reclassified from accumulated other comprehensive loss |  |  |  |  | 0 | 0 |
Total other comprehensive income |  |  |  |  | (31) | 25 |
Other comprehensive income attributable to noncontrolling interests |  |  |  |  | 0 | 0 |
Other comprehensive income (loss) attributable to Harsco Corporation |  |  |  |  | (31) | 25 |
Ending balance | (34) |  | (6) |  | (34) | (6) |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  |  | $ (21,429)
Components of Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |
Beginning balance | (616,476) | (587,622) | (584,425) | (567,107) | (587,622) | (567,107) |
Total other comprehensive income | 12,858 | (28,854) | 4,196 | 4,111 |  |  |
Ending balance | $ (603,618) | $ (616,476) | $ (580,229) | $ (584,425) | $ (603,618) | $ (580,229) |

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