Net Change in Credit Valuation Adjustment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Fair Value Measurements [Line Items]
Total change in credit valuation	$ (9,991)	$ 10,072
Other Expense
Fair Value Measurements [Line Items]
Total change in credit valuation	(8,045)	8,126
Accumulated Other Comprehensive Income (Loss)
Fair Value Measurements [Line Items]
Total change in credit valuation	$ (1,946)	$ 1,946