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Consolidated Statements of Stockholders' Equity (USD $) | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Deficit [Member] | Noncontrolling Interests [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 322,112,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 43,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 386,821,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (1,830,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (65,085,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 2,163,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Common stock, shares outstanding at Dec. 31, 2011 |  | 42,928,001 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to Acacia Research Corporation | 59,453,000 us-gaap_NetIncomeLoss |  |  |  |  | 59,453,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Payments of Dividends | 0 us-gaap_PaymentsOfDividends |  |  |  |  |  |
Sale of common stock, shares |  | 6,122,449 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Sale of common stock, value |  | 6,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 218,955,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Proceeds from Issuance or Sale of Equity | 218,961,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |  |  |  |  |  |
Treasury stock, shares acquired | 1,129,408 us-gaap_TreasuryStockSharesAcquired | (1,129,408)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stock Repurchased During Period, Shares | (1,000)us-gaap_StockRepurchasedDuringPeriodShares |  |  |  |  |  |
Treasury stock, cost of shares acquired | (26,732,000)us-gaap_TreasuryStockValueAcquiredCostMethod |  | (26,731,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Payments for Repurchase of Common Stock | 26,732,000 us-gaap_PaymentsForRepurchaseOfCommonStock |  |  |  |  |  |
Stock options exercised, shares |  | 71,272 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stock options exercised, value | 340,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  | 340,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures |  | 1,168,530 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Compensation expense related to stock options and restricted stock awards | 25,657,000 us-gaap_ShareBasedCompensation | 1,000 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 25,656,000 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Excess tax benefits from stock-based compensation | 13,210,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  |  | 13,210,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net (income) loss attributable to noncontrolling interests in operating subsidiaries | (164,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |  |  |  | (164,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Contributions from noncontrolling interests in operating subsidiary, net | 5,793,000 us-gaap_ProceedsFromPaymentsToMinorityShareholders |  |  |  |  |  | 5,793,000 us-gaap_ProceedsFromPaymentsToMinorityShareholders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Distributions to noncontrolling interests in operating subsidiary | (816,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders |  |  |  |  |  | (816,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Unrealized gain on foreign currency translation | 7,000 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |  |  |  |  |
Unrealized gain (loss) on short-term investments | 657,000 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  |  |  |
Balance at Dec. 31, 2012 | 618,478,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 49,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (26,731,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 644,982,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (1,166,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (5,632,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 6,976,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Common stock, shares outstanding at Dec. 31, 2012 |  | 49,160,844 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to Acacia Research Corporation | (56,434,000)us-gaap_NetIncomeLoss |  |  |  |  |  |
Payments of Dividends | 18,633,000 us-gaap_PaymentsOfDividends |  |  |  |  |  |
Sale of common stock, shares |  | 0 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Sale of common stock, value | (18,633,000)us-gaap_StockIssuedDuringPeriodValueNewIssues | 0 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (18,633,000)us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Treasury stock, shares acquired |  | (600,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stock Repurchased During Period, Shares | (1,000)us-gaap_StockRepurchasedDuringPeriodShares | (666)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Treasury stock, cost of shares acquired | (7,910,000)us-gaap_TreasuryStockValueAcquiredCostMethod |  | (7,909,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Payments for Repurchase of Common Stock | 7,926,000 us-gaap_PaymentsForRepurchaseOfCommonStock |  |  | (16,000)us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock options exercised, shares |  | 115,346 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stock options exercised, value | 486,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  | 486,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures |  | 709,533 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Compensation expense related to stock options and restricted stock awards | 27,894,000 us-gaap_ShareBasedCompensation | 1,000 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 27,893,000 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Excess tax benefits from stock-based compensation | (1,398,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  |  |  |  |  |
Net (income) loss attributable to noncontrolling interests in operating subsidiaries | (2,408,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |  |  |  | (2,408,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Contributions from noncontrolling interests in operating subsidiary, net | 1,920,000 us-gaap_ProceedsFromPaymentsToMinorityShareholders |  |  |  |  |  | 1,920,000 us-gaap_ProceedsFromPaymentsToMinorityShareholders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Unrealized Gain (Loss) on Investments | 219,000 us-gaap_UnrealizedGainLossOnInvestments |  |  |  | 219,000 us-gaap_UnrealizedGainLossOnInvestments / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Unrealized gain on foreign currency translation | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |  |  |  |  |
Unrealized gain (loss) on short-term investments | 26,000 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  |  |  |
Balance at Dec. 31, 2013 | 562,198,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 49,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (34,640,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 653,314,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (947,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (62,066,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 6,488,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Common stock, shares outstanding at Dec. 31, 2013 | 49,385,057 us-gaap_CommonStockSharesOutstanding | 49,385,057 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to Acacia Research Corporation | (66,029,000)us-gaap_NetIncomeLoss |  |  |  |  |  |
Payments of Dividends | 25,039,000 us-gaap_PaymentsOfDividends |  |  |  |  |  |
Sale of common stock, value | (25,039,000)us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  |  |
Treasury stock, shares acquired | 600,000 us-gaap_TreasuryStockSharesAcquired |  |  |  |  |  |
Payments for Repurchase of Common Stock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock |  |  |  |  |  |
Stock options exercised, shares | 45,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 44,506 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stock options exercised, value | 206,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  | 206,000 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures |  | 635,819 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Compensation expense related to stock options and restricted stock awards | 18,115,000 us-gaap_ShareBasedCompensation | 1,000 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 18,114,000 us-gaap_ShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Excess tax benefits from stock-based compensation | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  |  |  |  |  |
Net (income) loss attributable to noncontrolling interests in operating subsidiaries | (633,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |  |  |  | (633,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Contributions from noncontrolling interests in operating subsidiary, net | (364,000)us-gaap_ProceedsFromPaymentsToMinorityShareholders |  |  |  |  |  | (364,000)us-gaap_ProceedsFromPaymentsToMinorityShareholders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Foreign Currency Transaction Gain (Loss), Unrealized |  |  |  |  | (99,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Unrealized Gain (Loss) on Investments | 693,000 us-gaap_UnrealizedGainLossOnInvestments |  |  |  | 693,000 us-gaap_UnrealizedGainLossOnInvestments / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Unrealized gain on foreign currency translation | (128,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax |  |  |  |  |  |
Unrealized gain (loss) on short-term investments | (1,488,000)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  |  |  |  |
Balance at Dec. 31, 2014 | $ 489,048,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 50,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (34,640,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 646,595,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (353,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (128,095,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 5,491,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Common stock, shares outstanding at Dec. 31, 2014 | 50,065,382 us-gaap_CommonStockSharesOutstanding | 50,065,382 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |

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