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Remaining Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]  
2015 $ 14,641us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 14,211us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 13,715us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 12,401us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 11,586us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter 35,071us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Finite intangible assets, Net Carrying Amount $ 101,625acta_FiniteLivedIntangibleAssetsIncludingUnamortizedFiniteLivedNet