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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Comprehensive Income (Loss), Tax $ 20,264us-gaap_OtherComprehensiveIncomeLossTax $ (18,447)us-gaap_OtherComprehensiveIncomeLossTax $ 2,700us-gaap_OtherComprehensiveIncomeLossTax
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests   185,000us-gaap_MinorityInterestDecreaseFromRedemptions  
Cash dividends declared, Common, per share $ 0.82us-gaap_CommonStockDividendsPerShareDeclared $ 0.82us-gaap_CommonStockDividendsPerShareDeclared $ 0.82us-gaap_CommonStockDividendsPerShareDeclared
Stock options exercised, net, shares 0hsc_StockIssuedDuringPeriodSharesStockOptionsExercisedNetOfTaxObligationsSettledInShares 20,000hsc_StockIssuedDuringPeriodSharesStockOptionsExercisedNetOfTaxObligationsSettledInShares 38,900hsc_StockIssuedDuringPeriodSharesStockOptionsExercisedNetOfTaxObligationsSettledInShares
Stock Issued During Period, Shares, Restricted Stock Award Net of Forfeitures and Tax Obligations Settled in Shares 130,925hsc_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeituresAndTaxObligationsSettledInShares 74,297hsc_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeituresAndTaxObligationsSettledInShares 68,558hsc_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeituresAndTaxObligationsSettledInShares
Treasury shares repurchased, shares 0us-gaap_TreasuryStockSharesAcquired    
Noncontrolling Interest, Decrease from Deconsolidation 905,000us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation 15,909,000us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation 704,000us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation
Treasury Stock [Member]      
Treasury shares repurchased, shares 150,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_TreasuryStockMember
[1] 0us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_TreasuryStockMember
0us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_TreasuryStockMember
Additional Paid-in Capital [Member]      
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests   292,000us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Noncontrolling Interest, Decrease from Deconsolidation    (1,003,000)us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Noncontrolling Interest [Member]      
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests   (107,000)us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Noncontrolling Interest, Decrease from Deconsolidation $ 905,000us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 16,912,000us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
$ 704,000us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
[1] The Company repurchases shares in connection with the issuance of shares under stock-based compensation programs.