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Supplemental Cash Flow Information (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Supplemental Cash Flow Information [Abstract]      
Estimated federal income taxes paid $ 0actg_Estimatedfederalincometaxespaid $ 3,000,000actg_Estimatedfederalincometaxespaid $ 0actg_Estimatedfederalincometaxespaid
Income Taxes Receivable   3,251,000us-gaap_IncomeTaxReceivable  
Accrued distribution to noncontrolling interest 0actg_AccruedDistributionToNoncontrollingInterest 504,000actg_AccruedDistributionToNoncontrollingInterest  
Cash paid for state income taxes 172,000actg_CashPaidForStateIncomeTaxes 516,000actg_CashPaidForStateIncomeTaxes 771,000actg_CashPaidForStateIncomeTaxes
Foreign withholding taxes $ 5,159,000actg_ForeignWithholdingTaxes $ 4,605,000actg_ForeignWithholdingTaxes $ 11,890,000actg_ForeignWithholdingTaxes