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Income Taxes - Major Jurisdictions (Detail) | 6 Months Ended
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Jun. 30, 2013
United States [Member] |
Income Tax Contingency [Line Items] |
Tax Year | 2010
New York State [Member] |
Income Tax Contingency [Line Items] |
Tax Year | 2008
New York City [Member] |
Income Tax Contingency [Line Items] |
Tax Year | 2011
United Kingdom [Member] |
Income Tax Contingency [Line Items] |
Tax Year | 2006
Italy [Member] |
Income Tax Contingency [Line Items] |
Tax Year | 2007

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

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- Definition Tax year being audited in the income tax examination, in CCYY format. + References No definition available. + Details
Name: | us-gaap_IncomeTaxExaminationYearUnderExamination
Namespace Prefix: | us-gaap_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration