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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%

X

- Definition

Represents the minimum percentage of revenue typically generated by specified number of customers in any one calendar year.

+ References

No definition available.

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- Definition

Represents the number of calendar years in which top customers typically generate minimum specified percentage of revenue.

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- Definition

Represents the number of top customers who typically generate revenue in excess of a specified percentage of total revenues for the entity and consist of a different group of customers in each year.

+ References

No definition available.

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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)

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- Definition

Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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