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v2.4.1.9

Stockholders' Equity (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 21, 2012 | Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 15, 2013 | Nov. 16, 2012
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Gross proceeds from the sale of common stock | $ 225,000,000 actg_GrossProceedsFromIssuanceOfCommonStock |  |  |  |  |  |
Sale of common stock, price per share | $ 36.75 us-gaap_SaleOfStockPricePerShare |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  | 0 us-gaap_ProceedsFromIssuanceOfCommonStock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock | 218,961,000 us-gaap_ProceedsFromIssuanceOfCommonStock |  |
Stock repurchase program, authorized amount |  |  |  |  |  | 70,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | 100,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Dividends declared, per share |  |  | $ 0.50 us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |
Common stock dividends declared, quarterly |  | $ 0.125 actg_Commonstockdividendsdeclaredquarterly | $ 0.125 actg_Commonstockdividendsdeclaredquarterly |  |  |  |
Sale of common stock, value |  |  | (25,039,000)us-gaap_StockIssuedDuringPeriodValueNewIssues | (18,633,000)us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |
Payments of Dividends |  |  | 25,039,000 us-gaap_PaymentsOfDividends | 18,633,000 us-gaap_PaymentsOfDividends | 0 us-gaap_PaymentsOfDividends |  |
Dividends, payment date |  | Mar. 30, 2015 |  |  |  |  |
Dividends, record date |  | Mar. 02, 2015 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |
Sale of common stock, shares |  |  |  | 0 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,122,449 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Sale of common stock, value |  |  |  | $ 0 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 6,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |

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