Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Inventory [Line Items]
Finished goods	$ 53,090	$ 47,847
Raw materials	4,618	1,280
Inventory reserve	(2,962)	(2,021)
Inventory, Net, Total	54,746	47,106
Approved
Inventory [Line Items]
Finished goods	51,343	46,410
Raw materials	4,618	1,280
Inventory reserve	(1,525)	(2,021)
Inventory, Net, Total	54,436	45,669
Pending Regulatory Approval
Inventory [Line Items]
Finished goods	1,747	1,437
Inventory reserve	(1,437)
Inventory, Net, Total	$ 310	$ 1,437