Information by Segment and Geographic Area (Details)	12 Months Ended
Dec. 31, 2011
Sales \| Customer concentration risk
Operations by segment
Threshold for disclosure of risk concentrations (as a percent)	10.00%
Property, Plant and Equipment \| Geographic concentration risk
Operations by segment
Threshold for disclosure of risk concentrations (as a percent)	10.00%

Threshold percentage which the entity uses for disclosure of concentration of risk.

No definition available.

Name:	hsc_ThresholdForDisclosurePercentage
Namespace Prefix:	hsc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration