Intangibles - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets And Liabilities [Line Items]
Amortization expense from amortizable intangible assets	$ 160,960	$ 47,489	$ 21,589
Amortization of lease agreement intangible assets and liabilities	(1,447)	103	361
Amortization benefit recognized from the alliance and product supply agreement	$ (5,330)	$ (5,330)	$ (5,330)