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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 3,352,895	$ 2,985,281	$ 8,999,353	$ 8,059,205
Operating income (loss)	209,394	192,561	407,461	390,821
Depreciation	55,562	51,543	161,589	150,296
Corporate and Non-Allocated Costs
Segment Reporting Information [Line Items]
Operating income (loss)	(98,722)	(82,687)	(265,849)	(225,219)
Depreciation	5,445	4,559	14,218	12,609
Electric Power Infrastructure Services | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,876,097	1,617,736	5,274,456	4,756,416
Operating income (loss)	175,692	179,181	430,244	466,087
Depreciation	27,240	24,273	79,205	71,801
Pipeline and Industrial Infrastructure Services Division | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,476,798	1,367,545	3,724,897	3,302,789
Operating income (loss)	132,424	96,067	243,066	149,953
Depreciation	$ 22,877	$ 22,711	$ 68,166	$ 65,886

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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.

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