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Summary of Significant Accounting Policies Impact of revision (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]                      
Net Income (Loss) Attributable to Acacia Research Corporation $ (33,333,000) $ (15,711,000) $ (12,503,000) $ 5,113,000 $ 9,823,000 $ (6,619,000) $ 6,321,000 $ 49,928,000 $ (56,434,000) $ 59,453,000 $ 21,106,000
Net Income (Loss) Available to Common Stockholders, Basic                 (56,945,000) 57,564,000 20,265,000
Net Income (Loss) Available to Common Stockholders, Diluted                 (56,945,000) 57,577,000 20,273,000
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – basic - As Reported                   47,251,061 39,743,433
Weighted-average number of shares outstanding, basic - As Adjusted(1) 48,415,684 48,330,149 48,008,998 47,859,774 48,335,865 48,332,878 47,944,193 44,367,499 48,155,832 47,251,061 39,743,433
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – diluted - As Reported                   48,060,647 41,258,297
Weighted-average number of shares outstanding, diluted - As Adjusted(1) 48,415,684 48,330,149 48,008,998 48,104,242 48,607,141 48,332,878 48,294,782 44,764,064 48,155,832 47,584,120 40,150,600
Basic net income (loss) per common share, As Reported                   1.26 0.53
Basic income (loss) per common share $ (0.69) $ (0.33) $ (0.26) $ 0.10 $ 0.20 $ (0.14) $ 0.13 $ 1.08 $ (1.18) $ 1.22 $ 0.51
Diluted net income (loss) per common share - As Reported                   $ 1.24 $ 0.51
Diluted income (loss) per common share $ (0.69) $ (0.33) $ (0.26) $ 0.10 $ 0.20 $ (0.14) $ 0.13 $ 1.08 $ (1.18) $ 1.21 $ 0.50