Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income attributable to Acacia Research Corporation	$ 49,928	$ 12,353
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	2,430	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 52,358	$ 12,353