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Income Taxes Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]      
Statutory federal tax rate (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income and foreign taxes, net of federal tax effect 9.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 15.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign tax credit (8.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign (6.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign (15.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign
Noncontrolling interests in operating subsidiaries 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense
Non deductible permanent items 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 2.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Expired net operating loss carryforwards 0.00%actg_EffectiveIncomeTaxRateReconcilationExpiredNetOperatingLosses 2.00%actg_EffectiveIncomeTaxRateReconcilationExpiredNetOperatingLosses 0.00%actg_EffectiveIncomeTaxRateReconcilationExpiredNetOperatingLosses
Valuation allowance 39.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (13.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Total 6.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations (27.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 27.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations