Revenue Percent by Major Customers (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
General Motors
Revenue, Major Customer [Line Items]
Customer accounted for ten percent or more of net sales	15.00%	17.00%	19.00%
Ford
Revenue, Major Customer [Line Items]
Customer accounted for ten percent or more of net sales	14.00%	15.00%	15.00%