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Summary of Significant Accounting Policies (Details 3) (Foreign Exchange Forward Contracts, Maximum) | 12 Months Ended
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Dec. 31, 2012
Foreign Exchange Forward Contracts | Maximum |
Derivative [Line Items] |
Maximum typical term of foreign currency forward exchange contracts (in days) | 90 days

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- Definition Derivative, Maturity Period + References No definition available. + Details
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Namespace Prefix: | hsc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration