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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 $ 5,847 $ 7,623
Work-in-process 7,401 7,886
Finished products 33,234 28,308
Field inventory 22,963 22,629
Consignment inventory 5,765 6,155
Deferred cost of sales 9,481 10,772
Total Inventory $ 84,691 [1] $ 83,373
[1] Unaudited