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Summarized Financial Information Related to Companies Accounted for Under Equity Method of Accounting (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Schedule Of Equity Method Investments [Line Items]  
Non-current assets $ 51us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets [1]
Total assets 5,504us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets [1]
Current liabilities (including current portion of long-term debt) 9,411us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities [1]
Non-current liabilities 57us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities [1]
Stockholders' deficit (3,964)acta_EquityMethodInvestmentSummarizedFinancialInformationEquityDeficitOrCapital [1]
Total liabilities and stockholders' deficit 5,504us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity [1]
Cash and Cash Equivalents  
Schedule Of Equity Method Investments [Line Items]  
Current assets 4,487us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_CashAndCashEquivalentsMember		 [1]
Other Current Assets  
Schedule Of Equity Method Investments [Line Items]  
Current assets $ 966us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember		 [1]
[1] Includes (Actua voting ownership): Acquirgy (25%)