Subsequent Event - Weighted-Average Amortization Period for such Intangible Assets Acquired (Detail) (Talon Therapeutics, Inc. [Member], Subsequent Event [Member], USD $) In Thousands, unless otherwise specified	Jul. 17, 2013
Business Acquisition [Line Items]
Value of Intangible Assets Acquired	$ 46,300
In-process research and development Marqibo for ALL [Member]
Business Acquisition [Line Items]
Value of Intangible Assets Acquired	27,800
In-process research and development Marqibo for NHL [Member]
Business Acquisition [Line Items]
Value of Intangible Assets Acquired	$ 18,500