Summary of Total Revenues (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
Revenue from External Customer [Line Items]
Product sales, net	$ 230,386	$ 174,130	$ 631,602	$ 398,585
Royalties and contract revenues	1,774	1,385	5,047	3,691
Total revenues	232,160	175,515	636,649	402,276
Xyrem [Member]
Revenue from External Customer [Line Items]
Product sales, net	153,664	102,615	404,932	265,149
Erwinaze And Erwinase [Member]
Revenue from External Customer [Line Items]
Product sales, net	44,078	31,652	130,754	37,660
Prialt [Member]
Revenue from External Customer [Line Items]
Product sales, net	11,046	5,413	20,726	20,491
Psychiatry [Member]
Revenue from External Customer [Line Items]
Product sales, net	10,679	21,032	40,093	58,518
Other [Member]
Revenue from External Customer [Line Items]
Product sales, net	$ 10,919	$ 13,418	$ 35,097	$ 16,767