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Merger with Capella Education Company - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 8 Months Ended |
--- | --- | --- | --- | ---
Aug. 01, 2018 USD ($) University | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |
Number of independent universities | University | 2 |  |  |  |
Goodwill |  | $ 732,799 |  | $ 732,799 | $ 732,540
Merger costs |  | 7,179 | $ 5,347 |  |
Goodwill, Acquired During Period |  | 0 |  |  |
Capella Merger |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |
Share conversion ratio of common stock issued | 0.875 |  |  |  |
Goodwill | $ 725,999 |  |  |  |
Merger costs |  |  |  | 20,100 |
Issuance costs | 100 |  |  |  |
Reduction in current assets |  | 300 |  |  |
Reduction in deferred tax liabilities |  | 100 |  |  |
Course content and internally developed software including in Property and Equipment | $ 53,182 |  |  |  |
Amortization period (in years) | 3 years |  |  |  |
Goodwill, Acquired During Period |  | 200 |  |  |
Strayer University |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |
Goodwill | $ 330,600 | 337,381 |  | 337,381 | 337,381
Goodwill, Acquired During Period |  | 0 |  |  |
Capella University |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |
Goodwill | 395,400 | 395,418 |  | $ 395,418 | $ 395,159
Goodwill, Acquired During Period |  | $ 0 |  |  |
Relief From Royalty Approach Valuation Technique | Capella Merger |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |
Course content and internally developed software including in Property and Equipment | 14,000 |  |  |  |
Valuation, Cost Approach | Capella Merger |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |
Course content and internally developed software including in Property and Equipment | $ 5,000 |  |  |  |

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