Summary of Interest Rate Swaps (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Fair value	$ 3,200
Other Liabilities
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Fair value	(3,216)	(2,186)
Other Comprehensive Income
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Amount of gain/(loss) recognized in other comprehensive income	(4,045)	(2,504)
Interest Expense
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain/(loss) reclassified from accumulated other comprehensive income (effective portion)	(3,019)	(3,277)
Other Expense
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain/(loss) recognized in income (ineffective portion)	$ (4)	$ 7