Property and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Property, Plant and Equipment [Line Items]
Property and equipment	$ 1,168,304	$ 1,169,828	$ 1,182,148
Accumulated depreciation and depletion	736,011	722,688	728,326
Property and equipment, net	432,293	447,140	453,822
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	125,842	124,216	122,728
Quarry property [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	177,814	175,612	175,431
Building and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	80,916	81,272	81,217
Equipment and vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	718,965	733,158	753,776
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 64,767	$ 55,570	$ 48,996

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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