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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 842,716	$ 649,261
Accumulated Amortization	(414,153)	(372,081)
Intangible Assets, Net	$ 428,563	277,180
Remaining Weighted Average Amortization Period in Years	7 years 9 months 18 days
Indefinite-lived Intangible Assets [Line Items]
Intangible Assets	$ 845,716	652,261
Intangible Assets, Net	431,563	280,180
Engineering license
Indefinite-lived Intangible Assets [Line Items]
Intangible Assets	3,000	3,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	531,813	359,967
Accumulated Amortization	(197,646)	(165,715)
Intangible Assets, Net	$ 334,167	194,252
Remaining Weighted Average Amortization Period in Years	6 years 8 months 12 days
Backlog
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 140,984	135,578
Accumulated Amortization	(137,454)	(134,592)
Intangible Assets, Net	$ 3,530	986
Remaining Weighted Average Amortization Period in Years	3 months 18 days
Trade names
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 93,021	81,058
Accumulated Amortization	(25,379)	(21,559)
Intangible Assets, Net	$ 67,642	59,499
Remaining Weighted Average Amortization Period in Years	14 years 10 months 24 days
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 43,157	40,728
Accumulated Amortization	(31,754)	(30,168)
Intangible Assets, Net	$ 11,403	10,560
Remaining Weighted Average Amortization Period in Years	3 years 4 months 24 days
Patented rights and developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 22,511	22,482
Accumulated Amortization	(20,297)	(19,175)
Intangible Assets, Net	$ 2,214	3,307
Remaining Weighted Average Amortization Period in Years	2 years 3 months 18 days
Curriculum
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 11,230	9,448
Accumulated Amortization	(1,623)	(872)
Intangible Assets, Net	$ 9,607	$ 8,576
Remaining Weighted Average Amortization Period in Years	8 years 7 months 6 days

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