Inventories - Summary of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventory, Net [Abstract]
Raw materials	$ 18,848us-gaap_InventoryRawMaterials	$ 19,541us-gaap_InventoryRawMaterials
Work in process	2,644us-gaap_InventoryWorkInProcess	3,172us-gaap_InventoryWorkInProcess
Finished goods	2,492us-gaap_InventoryFinishedGoods	2,987us-gaap_InventoryFinishedGoods
Obsolescence allowance	(568)us-gaap_InventoryValuationReserves	(536)us-gaap_InventoryValuationReserves
Inventory, net	$ 23,416us-gaap_InventoryNet	$ 25,164us-gaap_InventoryNet

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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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.

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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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