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Inventories - Schedule of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 6,499 $ 7,623
Work-in-process 6,606 7,886
Finished products 31,342 28,308
Field inventory 34,932 22,629
Consignment inventory 3,916 6,155
Deferred cost of sales 7,282 10,772
Inventory, net $ 90,577 $ 83,373