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Acquisition Acquisition Deferred Tax (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 12, 2012
Business Acquisition [Line Items] |  |  |  |
Estimated tax rate | (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |
ADAPTIX, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Book basis of intangible assets acquired - patents |  |  |  | $ 150,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember
Tax basis of intangible assets acquired - patents |  |  |  | 0 actg_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssetsTaxBasis / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember
Change from book and tax basis of intangible assets acquired - patents |  |  |  | (150,000,000)actg_BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssetsChangeFromBookAndTaxBasis / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember
Estimated net operating loss carryforwards - ADAPTIX |  |  |  | 0 us-gaap_OperatingLossCarryforwards / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember
Tax basis of estimated net operating loss carryforwards - ADAPTIX |  |  |  | 63,860,000 actg_OperatingLossCarryforwardsTaxBasis / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember
Change from book and tax basis of estimated net operating loss carryforwards - ADAPTIX |  |  |  | 63,860,000 actg_OperatingLossCarryforwardsChangeFromBookAndTaxBasis / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember
Net deferred tax liability - pretax |  |  |  | (86,140,000)us-gaap_DeferredTaxLiabilities / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember
Estimated tax rate |  |  |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember
Deferred tax asset, acquisition |  |  |  | $ (30,149,000)actg_Deferredtaxassetacquisition / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember

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- Definition Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets, Tax Basis + References No definition available. + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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