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Acquisitions - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2018
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date |  | $ 52,400
Acquisitions 2018 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 52,364 |
Weighted average amortization period at acquisition date | 7 years 4 months 24 days |
Customer relationships | Acquisitions 2018 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 30,767 |
Weighted average amortization period at acquisition date | 5 years 3 months 18 days |
Backlog | Acquisitions 2018 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 2,158 |
Weighted average amortization period at acquisition date | 1 year |
Trade names | Acquisitions 2018 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 7,689 |
Weighted average amortization period at acquisition date | 15 years |
Non-compete agreements | Acquisitions 2018 |  |
Business Acquisition [Line Items] |  |
Estimated fair value at acquisition date | $ 2,750 |
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 |

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- 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 + Details
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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 + Details
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