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Fair Value Measurements (Summary of Valuation of Financial Assets and Liabilities) (Parentheticals) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability for interest rate swap $ 284us-gaap_InterestRateDerivativeLiabilitiesAtFairValue [1] $ 437us-gaap_InterestRateDerivativeLiabilitiesAtFairValue [2]
Contingent consideration 8,761acet_BusinessAcquisitionContingentConsiderationFairValue [3] 9,904acet_BusinessAcquisitionContingentConsiderationFairValue [4]
Accrued expenses    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability for interest rate swap 50us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember		  
Contingent consideration 4,361acet_BusinessAcquisitionContingentConsiderationFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember		 4,500acet_BusinessAcquisitionContingentConsiderationFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
Long-term liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative liability for interest rate swap 234us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LongTermDebtMember		  
Contingent consideration $ 4,400acet_BusinessAcquisitionContingentConsiderationFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LongTermDebtMember		 $ 5,404acet_BusinessAcquisitionContingentConsiderationFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LongTermDebtMember
[1] $50 included in "Accrued expenses" and $234 included in "Long-term liabilities" in the accompanying Condensed Consolidated Balance Sheet as of December 31, 2014.
[2] Included in "Long-term liabilities" in the accompanying Condensed Consolidated Balance Sheet as of June 30, 2014.
[3] $4,361 included in "Accrued expenses" and $4,400 included in "Long-term liabilities" in the accompanying Condensed Consolidated Balance Sheet as of December 31, 2014.
[4] $4,500 included in "Accrued expenses" and $5,404 included in "Long-term liabilities" in the accompanying Condensed Consolidated Balance Sheet as of June 30, 2014.