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Inventories - Schedule of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 6,354 $ 8,470
Work-in-process 7,401 7,886
Finished products 42,834 36,675
Field inventory 29,891 29,363
Consignment inventory 5,653 6,350
Inventory, net $ 92,133 $ 88,744