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Inventories - Schedule of Inventories, Net of Reserves (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 6,038 $ 7,623
Work-in-process 8,230 7,886
Finished products 40,682 28,308
Field inventory 31,682 22,629
Consignment inventory 4,589 6,155
Deferred cost of sales 8,983 10,772
Total Inventory $ 100,204 $ 83,373