Subsidiary Guarantors (Textuals) (Details)	9 Months Ended
	Oct. 03, 2015
Gentek Holdings, LLC and Gentek Building Products
Condensed Financial Statements, Captions [Line Items]
Ownership percent of guarantor subsidiaries	100.00%
AMH New Finance, Inc
Condensed Financial Statements, Captions [Line Items]
Ownership percent of guarantor subsidiaries	100.00%
Senior notes | 9.125% notes
Condensed Financial Statements, Captions [Line Items]
Debt instrument, interest rate, stated percentage	9.125%