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Goodwill and Other Intangible Assets - Summary of Changes in Goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Goodwill [Roll Forward]
Goodwill gross, beginning balance	$ 1,966,432
Accumulated impairment, beginning balance	(97,832)
Goodwill, beginning balance	1,868,600
Goodwill acquired	55,049	$ 55,000
Purchase price allocation adjustments	51
Foreign currency translation adjustments	(11,561)
Goodwill gross, ending balance	1,912,139	1,912,139
Accumulated impairment, ending balance	0	0
Goodwill, ending balance	1,912,139	1,912,139
Electric Power Infrastructure Services Division
Goodwill [Roll Forward]
Goodwill gross, beginning balance	1,272,527
Accumulated impairment, beginning balance	0
Goodwill, beginning balance	1,272,527
Goodwill acquired	55,049
Purchase price allocation adjustments	51
Foreign currency translation adjustments	(6,875)
Goodwill gross, ending balance	1,320,752	1,320,752
Accumulated impairment, ending balance	0	0
Goodwill, ending balance	1,320,752	1,320,752
Oil and Gas Infrastructure Services Division
Goodwill [Roll Forward]
Goodwill gross, beginning balance	693,905
Accumulated impairment, beginning balance	(97,832)
Goodwill, beginning balance	596,073
Goodwill acquired	0
Purchase price allocation adjustments	0
Foreign currency translation adjustments	(4,686)
Goodwill gross, ending balance	591,387	591,387
Accumulated impairment, ending balance	0	0
Goodwill, ending balance	$ 591,387	$ 591,387

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