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Subsequent Events - Additional Information (Detail) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 USD ($) Entity | Jun. 30, 2015 Entity | Mar. 31, 2015 Entity | Jun. 30, 2015 USD ($) Entity | Dec. 31, 2014 USD ($) Entity
Subsequent Event [Line Items] |  |  |  |  |
Number of business acquisitions |  | 3 | 3 | 6 | 9
Cash paid for acquisitions | $ |  |  |  | $ 64.7 | $ 279.5
Aggregate consideration paid or payable, Common stock value | $ |  |  |  |  | $ 134.5
Electric Power Infrastructure Services Business [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of business acquisitions |  |  |  | 4 |
United States [Member] | Electric Power Infrastructure Services Business [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of business acquisitions |  | 2 |  | 2 | 1
Australia [Member] | Electric Power Infrastructure Services Business [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of business acquisitions |  |  |  |  | 1
Scenario Forecast [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Cash paid for acquisitions | $ | $ 28.8 |  |  |  |
Aggregate consideration paid or payable, Common stock value | $ | $ 7.7 |  |  |  |
Scenario Forecast [Member] | United States [Member] | Electric Power Infrastructure Services Business [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of business acquisitions | 2 |  |  |  |
Scenario Forecast [Member] | Australia [Member] | Electric Power Infrastructure Services Business [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of business acquisitions | 1 |  |  |  |

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- Definition Aggregate business acquisition consideration of acquired entity cash paid and liabilities incurred during period. + References No definition available. + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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