Business Segments - Sales to Customers Contributing Ten Percent or More of Consolidated Sales (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Ford [Member]
Revenue, Major Customer [Line Items]
Major customers	25.00%	27.00%	28.00%
General Motors [Member]
Revenue, Major Customer [Line Items]
Major customers	18.00%	19.00%	19.00%
Fiat Chrysler Automobiles [Member]
Revenue, Major Customer [Line Items]
Major customers	12.00%	11.00%	11.00%