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Organization, Business and Significant Accounting Policies (Details 4)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts receivable | Concentrations of credit risk | One customer
Concentrations
Number of customers individually exceeding 10.0% of consolidated accounts receivable	1
Percentage of concentration risk	14.40%
Accounts receivable | Concentrations of credit risk | Two customers
Concentrations
Number of customers individually exceeding 10.0% of consolidated accounts receivable		2
Percentage of concentration risk		24.60%
Revenues | Customer concentration risk | One customer
Concentrations
Number of customers individually exceeding 10.0% of consolidated contract revenue		1
Percentage of concentration risk		15.10%
Revenues | Customer concentration risk | Ten customers
Concentrations
Percentage of concentration risk	57.80%	59.60%	58.10%
Labor employees covered by collective bargaining agreements | Craft labor employees
Concentrations
Percentage of concentration risk	92.00%

X

- Definition

Represents the number of customers individually exceeding 10 percent of consolidated accounts receivable.

+ References

No definition available.

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- Definition

Represents the number of customers individually exceeding 10 percent of consolidated contract revenue.

+ References

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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=28364263&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 275

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-Section 50

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