Property and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Property, Plant and Equipment [Line Items]
Property and equipment	$ 1,171,236	$ 1,169,828	$ 1,197,912
Accumulated depreciation and depletion	731,572	722,688	733,296
Property and equipment, net	439,664	447,140	464,616
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	126,396	124,216	124,892
Quarry property [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	177,792	175,612	173,055
Building and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	80,910	81,272	81,325
Equipment and vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	722,724	733,158	772,800
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 63,414	$ 55,570	$ 45,840

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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