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Equity Method Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended		0 Months Ended			0 Months Ended		3 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	0 Months Ended
	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013 WPE, Kealine and the Company Highstar	Jul. 01, 2010 WesPac	Jul. 01, 2010 WesPac Kealine	Sep. 30, 2013 WesPac Company	Feb. 05, 2014 Alvah, Inc.	Mar. 31, 2014 Alvah, Inc.	Nov. 17, 2012 Alvah, Inc.	Jun. 30, 2013 Alvah, Inc. ARB	Jun. 30, 2013 Alvah, Inc. ARB	Jun. 30, 2013 Alvah, Inc. Q3 Contracting	Jun. 30, 2013 Alvah, Inc. Q3 Contracting	Sep. 30, 2013 Midstream project	Sep. 30, 2014 Midstream Highstar Maximum	Sep. 30, 2013 Midstream Kealine
Equity method investments
Membership interest (as a percent)					50.00%	50.00%				49.00%
Cash proceeds from sale of projects				$ 6,082
Maximum potential bonus payments under the agreement based on attainment of milestones							9,000										4,500
Number of projects for which milestones must be attained for the potential bonus payments															1
Funding period																2 years
Cash paid by majority owner to purchase the Company's minority interest		1,189						1,189
Payments made to equity method investee											1,423	2,909	0	212
Company's equity in earnings	$ (213)	$ 14	$ 56						$ 14

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- Definition

Represents the period for which counterparty to agreement will fund operations of equity method investee.

+ References

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- Definition

Represents the number of projects for which milestones must be attained for the potential bonus payments.

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- Definition

Represents the maximum potential bonus payments under the agreement based on attainment of milestones.

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- Definition

Represents the subcontractor payments made to equity method investee.

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- Definition

The cash inflow associated with the sale of equity method investments project, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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