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Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 614,688	$ 598,686
Accumulated Amortization	(343,862)	(335,507)
Intangible Assets, Net	$ 270,826	263,179
Remaining Weighted Average Amortization Period in Years	9 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 328,270	327,334
Accumulated Amortization	(143,979)	(137,333)
Intangible Assets, Net	$ 184,291	190,001
Remaining Weighted Average Amortization Period in Years	7 years 1 month
Backlog
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 136,483	136,266
Accumulated Amortization	(135,277)	(135,847)
Intangible Assets, Net	$ 1,206	419
Remaining Weighted Average Amortization Period in Years	10 months 17 days
Trade names
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 80,654	74,797
Accumulated Amortization	(18,166)	(17,057)
Intangible Assets, Net	$ 62,488	57,740
Remaining Weighted Average Amortization Period in Years	15 years 10 months 15 days
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 37,754	37,760
Accumulated Amortization	(28,234)	(27,659)
Intangible Assets, Net	$ 9,520	10,101
Remaining Weighted Average Amortization Period in Years	3 years 9 months
Patented rights and developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 22,527	22,529
Accumulated Amortization	(18,032)	(17,611)
Intangible Assets, Net	$ 4,495	4,918
Remaining Weighted Average Amortization Period in Years	3 years 1 month
Curriculum
Finite-Lived Intangible Assets [Line Items]
Intangible Assets	$ 9,000	0
Accumulated Amortization	(174)	0
Intangible Assets, Net	$ 8,826	$ 0
Remaining Weighted Average Amortization Period in Years	9 years 10 months

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- Definition

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+ References

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

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+ References

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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