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Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 | Sep. 30, 2015 USD ($) segment | Sep. 30, 2014 | Dec. 31, 2014 USD ($)
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract] |  |  |  |  |
Number of reportable segments | segment |  |  | 5 |  |
Revenue Recognition [Line Items] |  |  |  |  |
Unapproved change orders, description |  |  | The Company may incur costs subject to change orders, whether approved or unapproved by the customer, and/or claims related to certain contracts. Management determines the probability that such costs will be recovered based upon engineering studies and legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer. The Company treats project costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/or recognizes revenue up to the amount of the related cost if it is probable that the contract price will be adjusted and can be reliably estimated. |  |
Unapproved change orders, expected to be billed and collected within one year, amount (in dollars) | $ 28.0 |  | $ 28.0 |  | $ 87.0
Maximum [Member] |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Fixed price contract, term within which generally completed (in years) |  |  | 1 year |  |
Change order approval process, term within which expected to be completed (in years) |  |  | 1 year |  |
Contracts Accounted for under Percentage-of-Completion [Member] | Maximum [Member] |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Change in accounting estimate, percentage-of-completion projects, financial effect on project profit, percentage |  |  | 5.00% | 5.00% |
Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member] | Power Generation and Industrial [Member] |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Project losses (in dollars) | 3.8 |  | $ 21.4 |  |
Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member] | Pacer [Member] | Joint Venture [Member] | Other [Member] |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Project losses (in dollars) | $ 2.8 |  | $ 8.3 |  |
Revenue [Member] | Master Service and Other Service Agreements [Member] | Concentration Risk from Type of Arrangement [Member] |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Concentration risk, percentage of total | 44.00% | 43.00% | 47.00% | 49.00% |

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