Reserves and Reserve Activities for Product Recall (Detail) (Inventory Valuation Product-Recalls, Warranty Reserves, USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Product Liability Contingency [Line Items]
Beginning balance	$ (121)
Changes in Estimates	7
Reserves Used	114
Ending balance
Excise tax credit
Product Liability Contingency [Line Items]
Beginning balance	(242)
Reserves Used	242
Ending balance
Recall-related costs
Product Liability Contingency [Line Items]
Beginning balance	54
Changes in Estimates	7
Reserves Used	(61)
Ending balance
Inventory reserves
Product Liability Contingency [Line Items]
Beginning balance	67
Reserves Used	(67)
Ending balance