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Organization, Business and Basis of Presentation (Details) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2013 item
Organization, Business and Basis of Presentation |  |
Number of business segments |  | 2
Additional gross margin recognized as the result of revised cost estimates on transmission projects (as a percent) | 0.60% | 0.80%

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- Definition Increase in gross margin percentage recognized as a result of revised cost estimates. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
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