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Subsidiary Guarantors (Textural) (Details)
 3 Months Ended
Apr. 04, 2015
Gentek Holdings, LLC and Gentek Building Products  
Condensed Financial Statements, Captions [Line Items]  
Ownership percent of guarantor subsidiaries 100.00%side_OwnershipPercentOfGuarantorSubsidiaries
/ dei_LegalEntityAxis
= side_GentekHoldingsLlcAndGentekBuildingProductsMember
AMH New Finance, Inc  
Condensed Financial Statements, Captions [Line Items]  
Ownership percent of guarantor subsidiaries 100.00%side_OwnershipPercentOfGuarantorSubsidiaries
/ dei_LegalEntityAxis
= side_AmhNewFinanceIncMember
Senior notes | 9.125% notes  
Condensed Financial Statements, Captions [Line Items]  
Debt instrument, interest rate, stated percentage 9.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= side_NinePointOneTwoFiveSecuredSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember