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Business Combinations - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 05, 2017 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |
Acquisition of CEC, net of cash acquired |  |  |  | $ 0 | $ 353,555
Community Education Centers |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of voting interests acquired | 100.00% |  |  |  |
Acquisition of CEC, net of cash acquired | $ 353,600 |  |  |  |
Measurement period adjustment |  |  | $ 1,000 |  |
Measurement period adjustment, valuation of an unfavorable contract liability |  |  | $ 1,400 |  |
Reduction in operating expenses |  | $ 2,300 |  |  |

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- Definition Amount of increase (decrease) in income that would have been recognized in previous periods if the adjustments to provisional amounts were recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472 + Details
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