XML 82 R70.htm IDEA: XBRL DOCUMENT
v3.21.2

Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Commitments and Contingencies Disclosure [Abstract] |  |
Current Portion of Environmental Liabilities | $ 7,005,000 | $ 6,933,000
Long-term environmental liabilities | 28,589,000 | 29,424,000
Total environmental liabilities | $ 35,594,000 | $ 36,357,000

X
- Definition Current Portion of Environmental Liabilities + References No definition available. + Details
Name: | hsc_CurrentPortionOfEnvironmentalLiabilities
Namespace Prefix: | hsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total Environmental Liabilities + References No definition available. + Details
Name: | hsc_TotalEnvironmentalLiabilities
Namespace Prefix: | hsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingenciesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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