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Tax Years Subject To Examination (Details)	12 Months Ended
	Dec. 31, 2013
Internal Revenue Service IRS [Member]
Income Tax Examination [Line Items]
Earliest Tax Year Open To Examination	2013
Alabama Tax [Member]
Income Tax Examination [Line Items]
Earliest Tax Year Open To Examination	2011
Illinois Tax [Member]
Income Tax Examination [Line Items]
Earliest Tax Year Open To Examination	2010
North Carolina Tax [Member]
Income Tax Examination [Line Items]
Earliest Tax Year Open To Examination	2010
Oregon Tax [Member]
Income Tax Examination [Line Items]
Earliest Tax Year Open To Examination	2010
Pennsylvania Tax [Member]
Income Tax Examination [Line Items]
Earliest Tax Year Open To Examination	2010
China Tax [Member]
Income Tax Examination [Line Items]
Earliest Tax Year Open To Examination	2009
Germany Tax [Member]
Income Tax Examination [Line Items]
Earliest Tax Year Open To Examination	2011
Poland Tax [Member]
Income Tax Examination [Line Items]
Earliest Tax Year Open To Examination	2009
United Kingdom Tax [Member]
Income Tax Examination [Line Items]
Earliest Tax Year Open To Examination	2011

X

- Definition

The earliest tax year still open to audit by the income tax examination authorities

+ References

No definition available.

+ Details

Name:	ati_EarliestTaxYearOpenToExamination
Namespace Prefix:	ati_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeTaxExaminationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration