XML 54 R74.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Leases - Narrative (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019
Leases [Abstract] |
Operating And Finance Leases, Excluding Short Term Leases, Weighted-Average Remaining Lease Term | 30 years 9 months 18 days
Operating And Finance Leases, Excluding Short Term Leases, Renewal Option | 10 years

X
- Definition Operating And Finance Leases, Excluding Short Term Leases, Renewal Option + References No definition available. + Details
Name: | hsc_OperatingAndFinanceLeasesExcludingShortTermLeasesRenewalOption
Namespace Prefix: | hsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating And Finance Leases, Excluding Short Term Leases, Weighted-Average Remaining Lease Term + References No definition available. + Details
Name: | hsc_OperatingAndFinanceLeasesExcludingShortTermLeasesWeightedAverageRemainingLeaseTerm
Namespace Prefix: | hsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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