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Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Nov. 30, 2011
Customer concentration |  |  |  |  |
Revenues | $ 445,013 | $ 337,436 | $ 855,008 | $ 629,009 |
Multiemployer Plans |  |  |  |  |
Withdrawal liability recorded | 7,500 |  | 7,500 |  | 7,500
Revenues | Customer concentration | Top ten customers |  |  |  |  |
Customer concentration |  |  |  |  |
Number of top customers | 10 | 10 | 10 | 10 |
Number of calendar years in which top customers typically generate minimum specified percentage of revenue |  |  | 1 |  |
Revenues | $ 216,000 | $ 185,000 | $ 443,000 | $ 364,000 |
Percentage of concentration risk | 48.60% | 54.80% | 51.90% | 57.90% |
Revenues | Customer concentration | Top ten customers | Minimum |  |  |  |  |
Customer concentration |  |  |  |  |
Minimum percentage of revenues generated by top ten customers |  |  | 50.00% |  |
Revenues | Customer concentration | Large gas and electric utility |  |  |  |  |
Customer concentration |  |  |  |  |
Percentage of concentration risk | 7.60% | 12.10% | 8.00% | 11.90% |
Revenues | Customer concentration | Large gas pipeline company |  |  |  |  |
Customer concentration |  |  |  |  |
Percentage of concentration risk | 8.20% |  | 5.00% |  |
Revenues | Customer concentration | One customer |  |  |  |  |
Customer concentration |  |  |  |  |
Percentage of concentration risk |  |  | 6.40% | 4.10% |
Revenues | Customer concentration | Louisiana DOT |  |  |  |  |
Customer concentration |  |  |  |  |
Percentage of concentration risk |  | 11.60% |  | 13.30% |
Accounts receivable | Customer concentration | One customer |  |  |  |  |
Customer concentration |  |  |  |  |
Percentage of concentration risk |  |  | 6.50% | 6.80% |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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