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Acquisitions And Dispositions (Sale of Strawberry Shortcake) - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Feb. 28, 2015
Mar. 03, 2015
Significant Acquisitions and Disposals [Line Items]    
Sale of assets, cash consideration $ 73,659us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets  
Strawberry Shortcake [Member] | Subsequent Event [Member]    
Significant Acquisitions and Disposals [Line Items]    
Sale of assets, cash consideration   $ 105,000us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= am_StrawberryShortcakeMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember