Inventory Stated at Lower of Cost (First- in, First- out) or Market (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Inventory [Line Items]
Raw materials	$ 1,464	$ 1,784
Finished goods	87,312	45,000
Inventory	$ 88,776	$ 46,784	[1]

[1] Derived from audited financial statements