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Inventories - Schedule of Inventories, Net of Reserves (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 8,639 $ 7,623
Work-in-process 8,112 7,886
Finished products 38,342 28,308
Field inventory 24,815 22,629
Consignment inventory 5,955 6,155
Deferred cost of goods sold 9,078 10,772
Total Inventory $ 94,941 $ 83,373