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Summary of Significant Accounting Policies - Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]      
Raw material $ 9,349us-gaap_InventoryRawMaterialsNetOfReserves $ 9,366us-gaap_InventoryRawMaterialsNetOfReserves $ 10,821us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 10,831us-gaap_InventoryWorkInProcessNetOfReserves 14,418us-gaap_InventoryWorkInProcessNetOfReserves 11,393us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 42,356us-gaap_InventoryFinishedGoodsNetOfReserves 35,468us-gaap_InventoryFinishedGoodsNetOfReserves 42,942us-gaap_InventoryFinishedGoodsNetOfReserves
Inventory, net $ 62,536us-gaap_InventoryNet $ 59,252us-gaap_InventoryNet $ 65,156us-gaap_InventoryNet