Acquisitions and Divestitures (Details) (USD $)	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2010	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Held for Sale
Current assets				$ 3,460,000	$ 3,695,000
Property, plant & equipment, net				9,625,000	11,016,000
Other assets				122,000	153,000
Total assets held for sale			0	13,207,000	14,864,000	[1]
Current liabilities			0	116,000	409,000	[1]
Liabilities of assets held for sale			0	116,000	409,000	[1]
Acquisitions and Divestitures (Textuals)
Number of ready-mixed concrete facilities acquired	10
Total consideration net of cash acquired	18,529,000		18,529,000		0
Number of shares of common stock valued at the closing date	432,407
Closing date price	$ 42.85
Number of shares issued to seller	368,527
Number of shares retained to fulfill certain working capital adjustments and indemnification obligations	63,880
Amortizable intangible assets recognized	6,246,000
Estimated weighted-average period intangible assets are to be amortized	20
Number of aggregates facilities sold		3
Cash proceeds from divestiture		$ 42,750,000

[1] As Restated, See Note 1