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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 3,112,218	$ 2,985,281	$ 2,656,348	$ 2,417,576	$ 2,478,627	$ 2,609,307	$ 2,200,374	$ 2,178,170	$ 11,171,423	$ 9,466,478	$ 7,651,319
Operating income (loss)									540,269	378,849	320,813
Depreciation									202,519	183,808	170,240
Operating Segments | Electric Power Infrastructure Services
Segment Reporting Information [Line Items]
Revenues									6,415,562	5,599,836	4,850,495
Operating income (loss)									628,286	518,130	395,745
Depreciation									96,300	91,708	91,269
Operating Segments | Pipeline and Industrial Infrastructure Services
Segment Reporting Information [Line Items]
Revenues									4,755,861	3,866,642	2,800,824
Operating income (loss)									204,178	184,083	149,502
Depreciation									89,046	76,355	67,374
Consolidated
Segment Reporting Information [Line Items]
Operating income (loss)									(292,195)	(323,364)	(224,434)
Depreciation									$ 17,173	$ 15,745	$ 11,597

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.

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