Schedule of Net Amount of Risk by Product and Guarantee (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Product Information [Line Items]
Net revenue by Product Line	$ 59,591	$ 42,680	$ 119,802	$ 80,960
Anti-infective
Product Information [Line Items]
Net revenue by Product Line	19,717	21,894	41,895	39,141
Critical care
Product Information [Line Items]
Net revenue by Product Line	13,670	15,477	32,744	32,988
Oncology
Product Information [Line Items]
Net revenue by Product Line	$ 26,204	$ 5,309	$ 45,163	$ 8,831