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Inventories - Schedule of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Inventories [Line Items]    
Raw materials $ 9,210 $ 10,115
Work-in-process 7,734 5,606
Finished products 45,718 49,141
Field inventory 38,041 39,400
Consignment inventory 7,085 7,551
Inventory, Gross 107,788 111,813
Less reserve for obsolescence (26,966) (28,844)
Inventories, net $ 80,822 $ 82,969