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Business Combinations - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 05, 2017 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |
Acquisition of CEC, net of cash acquired |  |  |  | $ 0 | $ 354,466
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 |  |
Operating expenses |  | $ 2,300 |  |  |

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