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Quarterly Financial Data (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
QUARTERLY FINANCIAL DATA (unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 15,065 | $ 15,520 | $ 23,110 | $ 76,861 | $ 66,264 | $ 34,939 | $ 50,484 | $ 99,040 |  |  |
Inventor royalties | 3,280 | 2,353 | 5,610 | 18,481 | 3,829 | 5,032 | 9,573 | 7,594 | 29,724 | 26,028 | 43,727
Contingent legal fees | 3,181 | 2,547 | 4,024 | 15,032 | 5,463 | 8,833 | 6,607 | 3,748 | 24,784 | 24,651 | 40,281
Litigation and licensing expenses - patents | 8,899 | 10,870 | 9,918 | 9,648 | 6,969 | 5,973 | 5,268 | 3,381 | 39,335 | 21,591 | 13,005
Amortization of patents | 16,735 | 12,615 | 12,578 | 11,730 | 18,088 | 10,412 | 5,393 | 5,126 | 53,658 | 39,019 | 9,745
Marketing, general and administrative expenses (including non-cash stock compensation expense) | (13,988) | (18,222) | (13,175) | (13,844) | (16,535) | (11,914) | (11,903) | (13,731) | (59,229) | (54,083) | (35,693)
Research, consulting and other expenses - business development | 742 | 743 | 735 | 1,031 | 721 | 1,139 | 1,967 | 1,116 | 3,251 | 4,943 | 4,338
Other | 0 | 3,506 | 0 | 0 | 0 | 0 | 0 | 0 | 3,506 | 0 | 0
Total operating costs and expenses | 46,825 | 50,856 | 46,040 | 69,766 | 51,605 | 43,303 | 40,711 | 34,696 | 213,487 | 170,315 | 141,999
Operating income (loss) | (31,760) | (35,336) | (22,930) | 7,095 | 14,659 | (8,364) | 9,773 | 64,344 | (82,931) | 80,412 | 30,257
Total other income (expense) | 161 | 280 | 400 | 1,290 | 820 | (41) | 102 | 56 | 2,131 | 937 | 96
Income (loss) from operations before benefit from (provision for) income taxes | (31,599) | (35,056) | (22,530) | 8,385 | 15,479 | (8,405) | 9,875 | 64,400 | (80,800) | 81,349 | 30,353
(Provision) benefit for income taxes | (3,390) | 19,570 | 9,050 | (3,272) | (5,757) | 1,938 | (3,494) | (14,747) | 21,958 | (22,060) | (8,708)
Net income (loss) including noncontrolling interests in operating subsidiaries | (34,989) | (15,486) | (13,480) | 5,113 | 9,722 | (6,467) | 6,381 | 49,653 | (58,842) | 59,289 | 21,645
Net (income) loss attributable to noncontrolling interests | 1,656 | (225) | 977 | 0 | 101 | (152) | (60) | 275 | 2,408 | 164 | (539)
Net Income (Loss) Attributable to Acacia Research Corporation | $ (33,333) | $ (15,711) | $ (12,503) | $ 5,113 | $ 9,823 | $ (6,619) | $ 6,321 | $ 49,928 | $ (56,434) | $ 59,453 | $ 21,106
Basic income (loss) per share - As Adjusted(1) | $ (0.69) | $ (0.33) | $ (0.26) | $ 0.10 | $ 0.20 | $ (0.14) | $ 0.13 | $ 1.08 | $ (1.18) | $ 1.22 | $ 0.51
Diluted income (loss) per share - As Adjusted(1) | $ (0.69) | $ (0.33) | $ (0.26) | $ 0.10 | $ 0.20 | $ (0.14) | $ 0.13 | $ 1.08 | $ (1.18) | $ 1.21 | $ 0.50
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 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
Earnings (loss) per share, basic, as previously reported |  |  | $ (0.26) | $ 0.11 | $ 0.20 | $ (0.14) | $ 0.13 | $ 1.13 |  |  |
Earnings (loss) per share, diluted as previously reported |  |  | $ (0.26) | $ 0.11 | $ 0.20 | $ (0.14) | $ 0.13 | $ 1.09 |  |  |
Weighted average number of shares, basic, as previously reported |  |  | 48,008,998 | 47,859,774 | 48,335,865 | 48,332,878 | 47,944,193 | 44,367,499 |  |  |
Weighted average number of shares, diluted, as previously reported |  |  | 48,008,998 | 48,354,444 | 48,797,304 | 48,332,878 | 48,938,766 | 45,771,228 |  |  |

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