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Inventories - Schedule of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 4,872	$ 6,515
Work-in-process	7,412	6,606
Finished products	40,758	36,898
Field inventory	28,787	29,360
Consignment inventory	4,354	3,916
Deferred cost of sales	6,570	7,282
Total Inventory	$ 92,753	$ 90,577

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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