Segment Reporting - Additional Information (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
State
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Dec. 31, 2011
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Dec. 31, 2010
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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
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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
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Segment Reporting Information [Line Items] | |||
Number of states in which segments serve | 3 | ||
Percentage of product weight attributable to Aggregates | 95.00% | ||
Concrete
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Segment Reporting Information [Line Items] | |||
Percentage of product weight attributable to Aggregates | 78.00% |