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Acquisition Pro Forma Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Business Combinations [Abstract] |
Pro forma revenues | $ 250,727 us-gaap_BusinessAcquisitionsProFormaRevenue
Pro forma total operating costs and expenses | 170,953 actg_BusinessAcquisitionProFormaOperatingCostsAndExpenses
Pro forma operating income | 79,774 actg_BusinessAcquisitionProFormaOperatingIncome
Pro forma interest and investment income | 937 actg_BusinessAcquisitionProFormaOtherIncome
Pro forma income from operations before provision for income taxes | 80,711 actg_BusinessAcquisitionProFormaIncomeFromOperationsBeforeProvisionForIncomeTaxes
Pro forma provision for income taxes | (22,060)actg_BusinessAcquisitionProFormaProvisionForIncomeTaxes
Pro forma net income including noncontrolling interests | 58,651 actg_BusinessAcquisitionProFormaNetIncomeIncludingNoncontrollingInterests
Pro forma net (income) loss attributable to noncontrolling interests | 164 actg_BusinessAcquisitionProFormaNetIncomeLossAttributableToNoncontrollingInterests
Pro forma net income attributable to Acacia Research Corporation | $ 58,815 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Pro forma income per common share attributable to Acacia Research Corporation [Abstract] |
Pro forma basic earnings per share | $ 1.24 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Pro forma diluted earnings per share | $ 1.22 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
Pro forma weighted average number of shares outstanding, basic | 47,251,061 actg_BusinessAcquisitionProFormaWeightedAverageNumberOfSharesBasic
Pro forma weighted average number of shares outstanding, diluted | 48,060,647 actg_BusinessAcquisitionProFormaWeightedAverageNumberOfSharesDiluted

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