Inventories - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jul. 28, 2012
Inventory Disclosure [Abstract]
Value of inventory increased						$ 89,754
Increase in cost of sales as a result of inventory adjustment	550	2,616	3,356	21,979
Inventory adjustment remaining in finished goods	$ 2,543		$ 2,543		$ 5,899