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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 649,261	$ 598,686
Accumulated Amortization	(372,081)	(335,507)
Finite-Lived Intangible Assets, Net	$ 277,180	263,179
Remaining Weighted Average Amortization Period	8 years
Indefinite-lived Intangible Assets [Line Items]
Intangible Assets	$ 652,261	598,686
Intangible Assets, Net	280,180	263,179
Engineering license
Indefinite-lived Intangible Assets [Line Items]
Intangible Assets	3,000	0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	359,967	327,334
Accumulated Amortization	(165,715)	(137,333)
Finite-Lived Intangible Assets, Net	$ 194,252	190,001
Remaining Weighted Average Amortization Period	6 years 2 months 12 days
Backlog
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 135,578	136,266
Accumulated Amortization	(134,592)	(135,847)
Finite-Lived Intangible Assets, Net	$ 986	419
Remaining Weighted Average Amortization Period	8 months 12 days
Trade names
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 81,058	74,797
Accumulated Amortization	(21,559)	(17,057)
Finite-Lived Intangible Assets, Net	$ 59,499	57,740
Remaining Weighted Average Amortization Period	15 years 4 months 24 days
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 40,728	37,760
Accumulated Amortization	(30,168)	(27,659)
Finite-Lived Intangible Assets, Net	$ 10,560	10,101
Remaining Weighted Average Amortization Period	3 years 7 months 6 days
Patented rights and developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 22,482	22,529
Accumulated Amortization	(19,175)	(17,611)
Finite-Lived Intangible Assets, Net	$ 3,307	4,918
Remaining Weighted Average Amortization Period	2 years 8 months 12 days
Curriculum
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 9,448	0
Accumulated Amortization	(872)	0
Finite-Lived Intangible Assets, Net	$ 8,576	$ 0
Remaining Weighted Average Amortization Period	9 years 1 month 6 days

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