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Acquisitions - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2018
Business Acquisition [Line Items]
Estimated fair value at acquisition date		$ 123,600
Acquisitions 2018
Business Acquisition [Line Items]
Estimated fair value at acquisition date	$ 19,836
Weighted average amortization period at acquisition date	10 years 2 months
Customer relationships | Acquisitions 2018
Business Acquisition [Line Items]
Estimated fair value at acquisition date	$ 3,328
Weighted average amortization period at acquisition date	5 years
Backlog | Acquisitions 2018
Business Acquisition [Line Items]
Estimated fair value at acquisition date	$ 1,055
Weighted average amortization period at acquisition date	1 year
Trade names | Acquisitions 2018
Business Acquisition [Line Items]
Estimated fair value at acquisition date	$ 6,257
Weighted average amortization period at acquisition date	15 years
Non-compete agreements | Acquisitions 2018
Business Acquisition [Line Items]
Estimated fair value at acquisition date	$ 196
Weighted average amortization period at acquisition date	5 years
Curriculum | Acquisitions 2018
Business Acquisition [Line Items]
Estimated fair value at acquisition date	$ 9,000
Weighted average amortization period at acquisition date	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://www.xbrl.org/2003/role/presentationRef
-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

No definition available.

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