Collaboration Agreements - Schedule of Collaboration Revenue (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Collaborative Arrangements [Line Items]
Total	$ 60,027	$ 64,798	$ 176,330	$ 144,535
U.S. XTANDI sales [Member]
Collaborative Arrangements [Line Items]
Attributable to U.S. XTANDI sales	54,244	7,056	133,134	7,056
Attributable to ex-U.S. XTANDI sales	1,551		2,033
Up-front cash payment arrangement [Member]
Collaborative Arrangements [Line Items]
Attributable to up-front and milestone payments	$ 4,232	$ 57,742	$ 41,163	$ 137,479