Summary of Total Revenues (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue from External Customer [Line Items]
Product sales, net	$ 304,407	$ 230,386	$ 838,493	$ 631,602
Royalties and contract revenues	2,177	1,774	6,240	5,047
Total revenues	306,584	232,160	844,733	636,649
Xyrem [Member]
Revenue from External Customer [Line Items]
Product sales, net	204,337	153,664	556,081	404,932
Erwinaze And Erwinase [Member]
Revenue from External Customer [Line Items]
Product sales, net	52,121	44,078	146,910	130,754
Defitelio [Member]
Revenue from External Customer [Line Items]
Product sales, net	18,892	0	51,345	0
Prialt [Member]
Revenue from External Customer [Line Items]
Product sales, net	6,282	11,046	16,422	20,726
Psychiatry [Member]
Revenue from External Customer [Line Items]
Product sales, net	10,833	10,679	32,431	40,093
Other [Member]
Revenue from External Customer [Line Items]
Product sales, net	$ 11,942	$ 10,919	$ 35,304	$ 35,097