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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
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock Options      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares 250us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		   2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Anti Dilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Price $ 4.30acta_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAveragePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		   $ 15.80acta_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAveragePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
SARs      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Anti dilutive Securities Excluded from Computation of Earnings Per Share, Shares 548,482us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockAppreciationRightsSARSMember		 28us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockAppreciationRightsSARSMember		 2,201us-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		 $ 12.47acta_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAveragePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockAppreciationRightsSARSMember		 $ 8.03acta_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 3,755,275us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember		 [1] 748us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember		 [1] 1,195us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember		 [1]
Anti Dilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Price   $ 8.22acta_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAveragePrice
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember		 [1] $ 9.18acta_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAveragePrice
/ 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 22,500us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember		 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= us-gaap_DeferredCompensationShareBasedPaymentsMember		  
[1] Anti-dilutive securities include contingently issuable shares unvested as of December 31, 2014, the vesting of which is based on performance conditions and market conditions that have not yet been achieved. See Note 12, “Equity-Based Compensation.”