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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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Business Combination Consideration Transferred Or To Be Transferred Cash And Liabilities Incurred

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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

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The number of businesses acquired by the entity during the period.

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