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Acquisitions (2016 Acquisitions) - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) Acquisition | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |
Aggregate consideration for acquisitions | $ | $ 42,211 | $ 110,428
Contingent consideration | $ | $ 15,400 | $ 1,001
Acquisitions 2016 [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions | Acquisition | 3 |
Aggregate consideration for acquisitions | $ | $ 42,200 |
Contingent consideration | $ | 15,400 |
Acquisitions 2016 [Member] | Maximum [Member] |  |
Business Acquisition [Line Items] |  |
Contingent consideration | $ | $ 35,000 |
Acquisitions 2016 [Member] | Electric Power Infrastructure Services Business [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions | Acquisition | 2 |
Acquisitions 2016 [Member] | Electric Power Infrastructure Services Business [Member] | United States [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions | Acquisition | 1 |
Acquisitions 2016 [Member] | Electric Power Infrastructure Services Business [Member] | Canada [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions | Acquisition | 1 |
Acquisitions 2016 [Member] | Oil and Gas Infrastructure Services Business [Member] | United States [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquisitions | Acquisition | 1 |

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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