Segment Reporting - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012 State	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Number of operating segments	4
Radius for delivering product, minimum	20
Radius for delivering product, maximum	25
Long-lived assets outside of the Unites States	$ 138,415,000	$ 142,988,000	$ 150,157,000
Equity method investment	22,965,000	22,876,000	22,852,000
Aggregates
Segment Reporting Information [Line Items]
Number of states in which segments serve	19
Number of additional states with railroad ballast served	10
Nondomestic net sales	$ 14,733,000	$ 16,678,000	$ 23,380,000
Asphalt Mix
Segment Reporting Information [Line Items]
Number of states in which segments serve	3
Percentage of product weight attributable to Aggregates	95.00%
Concrete
Segment Reporting Information [Line Items]
Percentage of product weight attributable to Aggregates	78.00%