Schedule of Fair Value of Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011	Sep. 24, 2011
Carrying Value | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	$ 149,953	$ 399,953	$ 399,998
Carrying Value | Senior Secured Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	250,000
Fair Value | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	149,984	381,067	388,000
Fair Value | Senior Secured Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long term debt	$ 255,938