Inventories - Schedule of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 107,357	$ 85,670
Work in progress	112,514us-gaap_InventoryWorkInProcess	119,929us-gaap_InventoryWorkInProcess
Finished goods	207,295us-gaap_InventoryFinishedGoods	195,971us-gaap_InventoryFinishedGoods
Inventory, gross, Total	427,166us-gaap_InventoryGross	401,570us-gaap_InventoryGross
Less: allowance for obsolete and excess inventory	(34,607)us-gaap_InventoryValuationReserves	(33,216)us-gaap_InventoryValuationReserves	(30,426)us-gaap_InventoryValuationReserves	(26,228)us-gaap_InventoryValuationReserves
Total inventory	$ 392,559us-gaap_InventoryNet	$ 368,354us-gaap_InventoryNet

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount of valuation reserve for inventory.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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