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Acquisitions - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Details) - 2018 Acquisitions $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Estimated fair value	$ 52,364
Weighted average amortization period	7 years 4 months 24 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated fair value	$ 30,767
Weighted average amortization period	5 years 3 months 18 days
Backlog
Finite-Lived Intangible Assets [Line Items]
Estimated fair value	$ 2,158
Weighted average amortization period	1 year
Trade names
Finite-Lived Intangible Assets [Line Items]
Estimated fair value	$ 7,689
Weighted average amortization period	15 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Estimated fair value	$ 2,750
Weighted average amortization period	5 years
Curriculum
Finite-Lived Intangible Assets [Line Items]
Estimated fair value	$ 9,000
Weighted average amortization period	10 years

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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