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Acquisition Pro Forma Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Business Combinations [Abstract] |  |
Pro forma revenues | $ 250,727 | $ 172,256
Pro forma total operating costs and expenses | 170,953 | 159,674
Pro forma operating income | 79,774 | 12,582
Pro forma interest and investment income | 937 | 96
Pro forma income from operations before provision for income taxes | 80,711 | 12,678
Pro forma provision for income taxes | (22,060) | (8,708)
Pro forma net income including noncontrolling interests | 58,651 | 3,970
Pro forma net (income) loss attributable to noncontrolling interests | 164 | (539)
Pro forma net income attributable to Acacia Research Corporation | $ 58,815 | $ 3,431
Pro forma income per common share attributable to Acacia Research Corporation [Abstract] |  |
Pro forma basic earnings per share | $ 1.24 |
Pro forma diluted earnings per share | $ 1.22 |
Pro forma weighted average number of shares outstanding, basic | 47,251,061 |
Pro forma weighted average number of shares outstanding, diluted | 48,060,647 |

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