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Organization, Business and Significant Accounting Policies (Details 4) | 12 Months Ended
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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% |  |

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- Definition Represents the number of customers individually exceeding 10 percent of consolidated contract revenue. + References No definition available. + Details
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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 -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=28364263&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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