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Supplemental Financial Information - Additional Information (Detail)
Jan. 31, 2015
Sep. 20, 2012
Mar. 12, 2012
Feb. 28, 2012
May 14, 2013
Mar. 15, 2013
Debt Instrument [Line Items]            
Percentage of ownership of domestic subsidiaries 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent          
2012 Notes | Issuer            
Debt Instrument [Line Items]            
Percentage senior secured first lien notes   9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LongtermDebtTypeAxis
= ck0000034115_TwoThousandTwelveNotesMember		 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LongtermDebtTypeAxis
= ck0000034115_TwoThousandTwelveNotesMember		 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LongtermDebtTypeAxis
= ck0000034115_TwoThousandTwelveNotesMember		    
2013 Notes | Issuer            
Debt Instrument [Line Items]            
Percentage senior secured first lien notes         7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LongtermDebtTypeAxis
= ck0000034115_TwoThousandThirteenNotesMember		 6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_LongtermDebtTypeAxis
= ck0000034115_TwoThousandThirteenNotesMember