Supplemental Guarantor Condensed Consolidating Financial Statements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended	6 Months Ended	12 Months Ended	1 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 29, 2012	Mar. 26, 2010 7.875% Senior Notes due 2018	Jun. 29, 2013 7.875% Senior Notes due 2018	Dec. 31, 2012 7.875% Senior Notes due 2018	Mar. 26, 2010 8.125% Senior Notes due 2020	Jun. 29, 2013 8.125% Senior Notes due 2020	Dec. 31, 2012 8.125% Senior Notes due 2020	Jun. 29, 2013 4.75% Senior Notes due 2023
Condensed Financial Statements, Captions [Line Items]
Long-term debt, aggregate principal amount						$ 280			$ 280		$ 500
Long-term debt, stated coupon rate						7.875%	7.875%		8.125%	8.125%	4.75%
Long-term debt, maturity date					Mar. 15, 2018	Mar. 15, 2018	Mar. 15, 2018	Mar. 15, 2020	Mar. 15, 2020	Mar. 15, 2020	Jan. 15, 2023
Selling, general and administrative expenses allocated from Lear	$ 30.3	$ 22.5	$ 61.6	$ 49.5