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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 2,839,199	$ 2,656,348	$ 5,646,458	$ 5,073,924
Operating income (loss)	78,580	123,039	198,067	198,260
Depreciation	53,811	50,034	106,027	98,753
Corporate and Non-Allocated Costs
Segment Reporting Information [Line Items]
Operating income (loss)	(84,298)	(66,801)	(167,127)	(142,532)
Depreciation	4,363	4,296	8,773	8,050
Electric Power Infrastructure Services | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,734,336	1,570,173	3,398,359	3,138,680
Operating income (loss)	92,935	146,011	254,552	286,906
Depreciation	26,714	23,258	51,965	47,528
Pipeline and Industrial Infrastructure Services Division | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,104,863	1,086,175	2,248,099	1,935,244
Operating income (loss)	69,943	43,829	110,642	53,886
Depreciation	$ 22,734	$ 22,480	$ 45,289	$ 43,175

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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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