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Inventories - Summary of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Component parts $ 16,806us-gaap_InventoryRawMaterialsAndSupplies $ 15,727us-gaap_InventoryRawMaterialsAndSupplies
Work-in-process and finished goods 15,891us-gaap_InventoryFinishedGoodsAndWorkInProcess 18,148us-gaap_InventoryFinishedGoodsAndWorkInProcess
Total $ 32,697us-gaap_InventoryNet $ 33,875us-gaap_InventoryNet