Collaboration Agreements (Schedule Of Collaboration Revenue) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Collaborative Arrangements [Line Items]
Total	$ 37,161	$ 64,798	$ 42,912	$ 36,825	$ 14,941	$ 14,940	$ 15,799	$ 14,709	$ 181,696	$ 60,389	$ 62,508
United States XTANDI Sales [Member]
Collaborative Arrangements [Line Items]
Attributable to U.S. XTANDI sales									35,752
Attributable to ex-U.S. XTANDI sales
Up-Front Cash Payment Arrangement [Member]
Collaborative Arrangements [Line Items]
Attributable to up-front and milestone payments									$ 145,944	$ 60,389	$ 62,508