Property and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment	$ 1,173,183	$ 1,169,828	$ 1,201,056
Accumulated depreciation and depletion	731,051	722,688	732,127
Property and equipment, net	442,132	447,140	468,929
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	125,596	124,216	124,932
Quarry property [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	177,274	175,612	173,067
Building and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	81,291	81,272	84,772
Equipment and vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	728,407	733,158	774,111
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 60,615	$ 55,570	$ 44,174

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, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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