Summary of Long-Term Debt and Related Weighted Average Interest Rates (Parenthetical) (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 26, 2010	Mar. 30, 2013	Dec. 31, 2012
7.875% Senior Notes due 2018
Debt Instrument [Line Items]
Long-term debt, stated coupon rate		7.875%	7.875%
Long-term debt, maturity date	Mar. 15, 2018	Mar. 15, 2018	Mar. 15, 2018
8.125% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term debt, stated coupon rate		8.125%	8.125%
Long-term debt, maturity date	Mar. 15, 2020	Mar. 15, 2020	Mar. 15, 2020
4.75% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt, stated coupon rate		4.75%
Long-term debt, maturity date		Jan. 15, 2023