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Represents the percentage of total contributions to the plan in a given plan yearto be considered a significant plan.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Represents the number of multiemployer plans from which the entity has withdrawn or plans to withdraw.

+ References

No definition available.

+ Details

Name:	hsc_MultiemployerPlanNumberOfPlansWithdrawn
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- Definition

Represents the contributions made by the entity as a percentage of total contributions to multiemployer plans for the three most recently completed plan years.

+ References

No definition available.

+ Details

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- Definition

Amount of accumulated benefit obligation attributable to the pension or postretirement benefit plan to which two or more unrelated employers contribute, where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

No definition available.

+ Details

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- Definition

Represents the funded percentage of a defined benefit plan in the green zone, which is determined to be in neither critical status nor endangered status.

+ References

No definition available.

+ Details

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- Definition

Amount of plan assets attributable to the pension or postretirement benefit plan to which two or more unrelated employers contribute, where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

No definition available.

+ Details

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- Definition

Amount of contributions made to the multiemployer plan by all employers who participate in the plan. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute, where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

No definition available.

+ Details

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- Definition

Represents the funded percentage of a defined benefit plan in the red zone, determined to be in critical status, based on criteria established under the internal revenue code.

+ References

No definition available.

+ Details

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- Definition

Represents the funded percentage of a defined benefit plan in the yellow zone, determined to be in endangered status, based on criteria established under the internal revenue Code.

+ References

No definition available.

+ Details

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- Definition

Amount of contributions made to multiemployer plans for each period for which a statement of income is presented. An employer may disclose total contributions to multiemployer plans without disaggregating the amounts attributable to pension plans and other postretirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Section 50

-Paragraph 1

-SubTopic 80

-Topic 715

-URI http://asc.fasb.org/extlink&oid=6958064&loc=d3e29142-114947

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- Definition

Amount of a recognized obligation to a multiemployer plan in the event that the employer withdraws from the plan. In some situations, withdrawal from a multiemployer plan may result in an employer having an obligation to the plan for a portion of the unfunded benefit obligation of the pension plans and other postretirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Employee Benefit Plans (Details 7) (USD $)	12 Months Ended
Employee Benefit Plans (Details 7) (USD $)	Dec. 31, 2011	Dec. 31, 2010 plan	Dec. 31, 2009	Dec. 31, 2011 Minimum	Dec. 31, 2011 Maximum	Dec. 31, 2011 Cumberland MD Vicinity Building Construction Employees Trust Fund	Dec. 31, 2010 Cumberland MD Vicinity Building Construction Employees Trust Fund	Dec. 31, 2009 Cumberland MD Vicinity Building Construction Employees Trust Fund	Dec. 31, 2010 Cumberland MD Vicinity Building Construction Employees Trust Fund Minimum	Dec. 31, 2009 Cumberland MD Vicinity Building Construction Employees Trust Fund Minimum	Dec. 31, 2008 Cumberland MD Vicinity Building Construction Employees Trust Fund Minimum	Dec. 31, 2011 Greater Pennsylvania Carpenters' Pension Fund	Dec. 31, 2010 Greater Pennsylvania Carpenters' Pension Fund	Dec. 31, 2009 Greater Pennsylvania Carpenters' Pension Fund	Dec. 31, 2009 Greater Pennsylvania Carpenters' Pension Fund Minimum	Dec. 31, 2011 Ohio Carpenters' Pension Plan	Dec. 31, 2010 Ohio Carpenters' Pension Plan	Dec. 31, 2009 Ohio Carpenters' Pension Plan	Dec. 31, 2011 New Zealand Steel Pension Fund	Dec. 31, 2010 New Zealand Steel Pension Fund	Dec. 31, 2009 New Zealand Steel Pension Fund	Dec. 31, 2010 New Zealand Steel Pension Fund Minimum	Dec. 31, 2009 New Zealand Steel Pension Fund Minimum	Dec. 31, 2011 All other multiemployer plans	Dec. 31, 2010 All other multiemployer plans	Dec. 31, 2009 All other multiemployer plans
Multiemployer Plans
Percentage for plan in red zone					65.00%
Percentage for plan in yellow zone				65.00%	80.00%
Percentage for plan in green zone				80.00%
Contributions By The Company	$ 26,913,000	$ 22,989,000	$ 22,512,000			$ 620,000	$ 430,000	$ 466,000				$ 2,415,000	$ 1,996,000	$ 2,756,000		$ 953,000	$ 1,145,000	$ 1,637,000	$ 891,000	$ 810,000	$ 761,000			$ 22,034,000	$ 18,608,000	$ 16,892,000
Contributions to multi-employer pension plans (as a percent)									5.00%	5.00%	5.00%				5.00%							5.00%	5.00%
Withdrawal cost related to multi-employer pension plans		8,300,000
Number of multi-employer plans withdrawn or plans to withdraw		10
Minimum contribution to the plan in a plan year to classify it as a significant plan as a percent of total contributions (as a percent)	5.00%	5.00%	5.00%
Total assets																			253,900,000	225,100,000
Total actuarial present value of accumulated plan benefits																			278,400,000	251,100,000
Total contributions for all participating employers																			$ 11,300,000	$ 11,300,000