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Debt - Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
Feb. 28, 2014
Debt Disclosure [Line Items]    
Term loan, due 2019 $ 250,000us-gaap_DebtInstrumentCarryingAmount $ 340,000us-gaap_DebtInstrumentCarryingAmount
Revolving credit facility, due 2018 4,300us-gaap_LineOfCredit 4,500us-gaap_LineOfCredit
Unamortized financing fees (6,752)am_UnamortizedDeferredFinancingFees (10,567)am_UnamortizedDeferredFinancingFees
Long-term debt 472,729us-gaap_LongTermDebt 559,114us-gaap_LongTermDebt
Long-term debt 472,729us-gaap_LongTermDebt 559,114us-gaap_LongTermDebt
Current portion of term loan 0us-gaap_DebtCurrent (20,000)us-gaap_DebtCurrent
Long-term debt, Non current 472,729us-gaap_LongTermDebtNoncurrent 539,114us-gaap_LongTermDebtNoncurrent
7.375% Senior Notes, Due 2021 [Member]    
Debt Disclosure [Line Items]    
Notes 225,000us-gaap_UnsecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= am_SeniorNotesSevenPointThreeSevenFivePercentDueTwoZeroTwoOneMember
225,000us-gaap_UnsecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= am_SeniorNotesSevenPointThreeSevenFivePercentDueTwoZeroTwoOneMember
6.10% Senior Notes, Due 2028 [Member]    
Debt Disclosure [Line Items]    
Notes $ 181us-gaap_UnsecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= am_SeniorNotesSixPointOneZeroPercentDueTwoZeroTwoEightMember
$ 181us-gaap_UnsecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= am_SeniorNotesSixPointOneZeroPercentDueTwoZeroTwoEightMember