Acquisitions and Divestitures - Additional information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Significant Acquisitions and Disposals [Line Items]
Payment for acquisition of businesses	$ 60,212,000		$ 0
Goodwill recognized in business acquisition	9,759,000	[1]
Amortizable intangible assets and goodwill tax deductible term	15 years
Cash proceeds from divestiture	18,164,000		11,827,000
Gain recognized on divested assets	2,802,000
Proceeds from sale of property, plant & equipment	1,623,000		10,750,000
Aggregates
Significant Acquisitions and Disposals [Line Items]
Number of production facilities acquired	2
Goodwill recognized in business acquisition	9,759,000	[1]
Contractual Rights
Significant Acquisitions and Disposals [Line Items]
Amortizable intangible assets recognized in business acquisition	800,000
Estimated weighted-average amortization period of intangible assets	20 years
Real Estate
Significant Acquisitions and Disposals [Line Items]
Proceeds from sale of property, plant & equipment			9,691,000
Gain (loss) on sale of property			5,979,000
Manufacturing Facility
Significant Acquisitions and Disposals [Line Items]
Cash proceeds from divestiture	5,133,000
Concrete
Significant Acquisitions and Disposals [Line Items]
Number of facilities divested	2
Proceeds from sale of property, plant & equipment	622,000
Gain recognized on sale of equipment and other personal property	$ 457,000

[1] The goodwill of acquired/divested businesses relates to the 2013 acquisitions/divestitures discussed in Note 16.