Summary of Long-Term Debt and Related Weighted Average Interest Rates (Detail) (USD $) In Millions, unless otherwise specified	Mar. 30, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 1,056.8	[1]	$ 626.3
7.875% Senior Notes due 2018
Debt Instrument [Line Items]
Long-term debt	278.6		313.4
Weighted Average Interest Rate	8.00%		8.00%
8.125% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term debt	278.2		312.9
Weighted Average Interest Rate	8.25%		8.25%
4.75% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt	$ 500.0
Weighted Average Interest Rate	4.75%

[1] Unaudited.