Fair Value Measurements - Carrying Value and Estimated Fair Values of Outstanding Debt (Detail) (USD $) In Millions, unless otherwise specified	Dec. 29, 2012		Dec. 31, 2011
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding debt	$ 649.2		$ 635.9
Estimate of Fair Value, Fair Value Disclosure [Member] | 8.375% Senior Notes Due in 2017 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding debt	234.4		231.4
Estimate of Fair Value, Fair Value Disclosure [Member] | 8.125% Senior Notes Due in 2018 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding debt	414.8		404.5
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding debt	590.0		590.0
Carrying (Reported) Amount, Fair Value Disclosure [Member] | 8.375% Senior Notes Due in 2017 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding debt	215.0	[1]	215.0	[1]
Carrying (Reported) Amount, Fair Value Disclosure [Member] | 8.125% Senior Notes Due in 2018 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding debt	$ 375.0	[1]	$ 375.0	[1]

[1] The fair values were based on the trading levels and bid/offer prices observed by a market participant and are considered level 1 financial instruments.