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Guarantor Non-Guarantor Subsidiary Financial Information Level 4 (Details) - Additional Information
Mar. 31, 2015
Dec. 31, 2014
6.625% First Priority Senior Notes Due 2020 [Member]    
Debt Instrument, Interest Rate, Stated Percentage 6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= msc_A6625FirstPrioritySeniorNotesDue2020Member		 6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= msc_A6625FirstPrioritySeniorNotesDue2020Member
8.875% Senior Secured Notes Due 2018 [Member]    
Debt Instrument, Interest Rate, Stated Percentage 8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= msc_A8875SeniorSecuredNotesDue2018Member		 8.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= msc_A8875SeniorSecuredNotesDue2018Member
9.00% Second-Priority Senior Secured Notes Due 2020 [Member]    
Debt Instrument, Interest Rate, Stated Percentage 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= msc_A900SecondPrioritySeniorSecuredNotesDue2020Member		 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= msc_A900SecondPrioritySeniorSecuredNotesDue2020Member