Net Change in Credit Valuation Adjustment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 23, 2013	Mar. 24, 2012
Fair Value Measurements [Line Items]
Total change in credit valuation	$ (552)	$ (6,955)
Discontinued Operations
Fair Value Measurements [Line Items]
Total change in credit valuation	(552)	(5,009)
Accumulated Other Comprehensive Income (Loss)
Fair Value Measurements [Line Items]
Total change in credit valuation		$ (1,946)