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Inventories - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Inventory [Line Items]      
Inventory written down $ 4,561us-gaap_InventoryWriteDown $ 2,503us-gaap_InventoryWriteDown $ 1,631us-gaap_InventoryWriteDown