Operating Property (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Property, Plant and Equipment [Line Items]
Land	$ 9,148	$ 7,982
Buildings and improvements	33,160	33,622
Trailing equipment	245,430	230,213
Other equipment	47,576	46,135
Total operating property, gross	335,314	317,952
Less accumulated depreciation and amortization	157,985	158,999
Total operating property, net	$ 177,329	$ 158,953