Accounting Policies - Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Inventories, Net [Abstract]
Raw materials	$ 18,018us-gaap_InventoryRawMaterials	$ 22,009us-gaap_InventoryRawMaterials
Work in process	28,756us-gaap_InventoryWorkInProcess	28,414us-gaap_InventoryWorkInProcess
Finished goods (includes consigned inventory of $8,582 in 2014 and $8,697 in 2013)	43,072us-gaap_InventoryFinishedGoods	41,845us-gaap_InventoryFinishedGoods
Inventory allowances	(6,296)us-gaap_InventoryValuationReserves	(8,338)us-gaap_InventoryValuationReserves
Inventories, net	83,550us-gaap_InventoryNet	83,930us-gaap_InventoryNet
Consigned inventory	8,582	8,697
Reserve for obsolete inventory	$ 0us-gaap_InventoryWriteDown	$ 954us-gaap_InventoryWriteDown

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

Amount of valuation reserve for inventory.

+ References

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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.

+ References

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-Name Regulation S-X (SX)

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- Definition

Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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- Definition

Gross amount of inventory owned by the entity but in the hands of a customer, typically a reseller.

+ References

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