Intangible Assets and Goodwill - Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	6 Months Ended		6 Months Ended
	May 29, 2013	Jun. 30, 2013 As Restated [Member]	Dec. 31, 2012 As Restated [Member]	Jun. 30, 2013 FOLOTYN developed technology [Member] As Restated [Member] US & Canada [Member]	Jun. 30, 2013 ZEVALIN [Member] As Restated [Member] U.S. [Member]	Jun. 30, 2013 ZEVALIN [Member] As Restated [Member] Ex. U.S. [Member]	Jun. 30, 2013 FUSILEV [Member] As Restated [Member]	Jun. 30, 2013 FOLOTYN distribution rights [Member] As Restated [Member]	Jun. 30, 2013 Melphalan license [Member] As Restated [Member]
Product Rights [Line Items]
Gross Amount		$ 236,168			$ 41,900	$ 23,490	$ 16,778	$ 27,900	$ 7,700
Gross Amount				118,400
Accumulated Amortization		(37,696)			(21,595)	(3,604)	(3,966)	(2,300)
Accumulated Amortization				(6,231)
Foreign Currency Translation		(663)				(663)
Foreign Currency Translation
Impairment	(1,023)	(1,023)						(1,023)
Net Amount		$ 196,786	$ 200,234	$ 112,169	$ 20,305	$ 19,223	$ 12,812	$ 24,577	$ 7,700
Amortization Period (years)				13 years 6 months	5 years 6 months	8 years 9 months 18 days	6 years 6 months	9 years 1 month 6 days