Operating Property (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Land	$ 7,982	$ 7,982
Buildings and improvements	33,622	33,688
Trailing equipment	230,213	204,117
Other equipment	46,135	42,163
Total operating property, gross	317,952	287,950
Less accumulated depreciation and amortization	158,999	145,804
Total operating property, net	$ 158,953	$ 142,146

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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