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Tax Years Subject To Examination (Details) | 12 Months Ended
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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

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