Collaboration Agreements (Schedule Of Collaboration Revenue) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Collaborative Arrangements Non collaborative Arrangements And Business Acquisitions Transactions [Line Items]
Total collaboration revenue	$ 64,798	$ 14,940	$ 144,535	$ 45,448
United States XTANDI Sales [Member]
Collaborative Arrangements Non collaborative Arrangements And Business Acquisitions Transactions [Line Items]
Attributable to U.S. XTANDI sales	7,056		7,056
Attributable to ex-U.S. XTANDI sales
Up-Front And Milestone Payments [Member]
Collaborative Arrangements Non collaborative Arrangements And Business Acquisitions Transactions [Line Items]
Attributable to up-front and milestone payments	$ 57,742	$ 14,940	$ 137,479	$ 45,448