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Potentially Dilutive Securities Not Included in Computation of Diluted Net Loss Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
SARs    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares 542us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockAppreciationRightsSARSMember		 939us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockAppreciationRightsSARSMember
Anti Dilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Price $ 10.72acta_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAveragePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockAppreciationRightsSARSMember		 $ 9.10acta_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAveragePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockAppreciationRightsSARSMember
Restricted Stock    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares 3,509us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember		 [1] 3,739us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember		 [1]
DSUs    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares   23us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember
[1] Anti-dilutive securities include contingently issuable shares unvested as of March 31, 2015 and 2014, the vesting of which is based on performance conditions and market conditions that have not yet been achieved. See Note 9, “Equity-Based Compensation.”