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Segment Information - Summarized Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 2,478,627	$ 2,609,307	$ 2,200,374	$ 2,178,170	$ 2,102,966	$ 2,042,186	$ 1,792,430	$ 1,713,737	$ 9,466,478	$ 7,651,319	$ 7,572,436
Operating income (loss)									378,849	320,813	237,503
Depreciation									183,808	170,240	162,845
Operating Segments | Electric Power Infrastructure Services
Segment Reporting Information [Line Items]
Revenues									5,599,836	4,850,495	4,937,289
Operating income (loss)									518,130	395,745	362,328
Depreciation									91,708	91,269	89,150
Operating Segments | Oil and Gas Infrastructure Services
Segment Reporting Information [Line Items]
Revenues									3,866,642	2,800,824	2,635,147
Operating income (loss)									184,083	149,502	142,929
Depreciation									76,355	67,374	65,315
Consolidated
Segment Reporting Information [Line Items]
Operating income (loss)									(323,364)	(224,434)	(267,754)
Depreciation									$ 15,745	$ 11,597	$ 8,380

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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