Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 2,999,816	$ 2,506,231	$ 5,703,397	$ 5,270,326
Operating income (loss)	161,651	112,916	275,380	193,653
Depreciation	62,757	54,526	124,864	108,936
Corporate and Non-Allocated Costs
Segment Reporting Information [Line Items]
Operating income (loss)	(99,185)	(92,230)	(193,304)	(171,528)
Depreciation	4,535	4,107	8,910	8,269
Electric Power Infrastructure Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,147,775	1,792,918	4,207,895	3,559,945
Operating income (loss)	236,899	183,896	435,934	312,654
Depreciation	37,084	28,987	73,729	57,700
Underground Utility and Infrastructure Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	852,041	713,313	1,495,502	1,710,381
Operating income (loss)	23,937	21,250	32,750	52,527
Depreciation	$ 21,138	$ 21,432	$ 42,225	$ 42,967