Leased Property Under Capital Leases - Leased Property Under Capital Leases (Detail) (USD $) In Thousands, unless otherwise specified				6 Months Ended
	Jun. 30, 2013	Dec. 30, 2012	Jul. 01, 2012	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]
Capital Leased Assets [Line Items]
Leased property under capital leases	$ 94,174	$ 94,180	$ 94,180
Less: Accumulated amortization	42,931	40,030	37,128
Leased property under capital leases, net	$ 51,243	$ 54,150	$ 57,052
Leased property under capital leases, Estimated Useful Lives				3 years	20 years