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Business and Organization - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 04, 2015 USD ($) | Sep. 30, 2015 USD ($) Entity | Jun. 30, 2015 Entity | Mar. 31, 2015 Entity | Jun. 30, 2015 Entity Segment | Dec. 31, 2014 Entity
Organization And Description Of Business [Line Items] |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  | 2 |
Number of business acquisitions |  |  | 3 | 3 | 6 | 9
Electric Power Infrastructure Services Business [Member] |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |
Number of business acquisitions |  |  |  |  | 4 |
Electric Power Infrastructure Services Business [Member] | Canada [Member] |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |
Number of business acquisitions |  |  | 1 | 1 | 2 | 4
Electric Power Infrastructure Services Business [Member] | Australia [Member] |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |
Number of business acquisitions |  |  |  |  |  | 1
Electric Power Infrastructure Services Business [Member] | Australia [Member] | Scenario Forecast [Member] |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |
Number of business acquisitions |  | 1 |  |  |  |
Electric Power Infrastructure Services Business [Member] | United States [Member] |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |
Number of business acquisitions |  |  | 2 |  | 2 | 1
Electric Power Infrastructure Services Business [Member] | United States [Member] | Scenario Forecast [Member] |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |
Number of business acquisitions |  | 2 |  |  |  |
Oil and Gas Infrastructure Services Business [Member] | Canada [Member] |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |
Number of business acquisitions |  |  |  | 1 | 1 | 2
Oil and Gas Infrastructure Services Business [Member] | Australia [Member] |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |
Number of business acquisitions |  |  |  | 1 | 1 |
Oil and Gas Infrastructure Services Business [Member] | United States [Member] |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |
Number of business acquisitions |  |  |  |  |  | 1
Fiber Optic Licensing Division [Member] | Scenario Forecast [Member] |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |
Gain on sale, Net of tax | $ |  | $ 175 |  |  |  |
Fiber Optic Licensing Division [Member] | Subsequent Event [Member] |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |
Sales price of fiber optic licensing operations | $ | $ 1,000 |  |  |  |  |
Net cash proceeds from sale of fiber optic licensing operations | $ | $ 830 |  |  |  |  |

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