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Business Combinations - Fair Value of Consideration Transferred (Details) |  | 12 Months Ended
--- | --- | ---
Aug. 01, 2018 USD ($) item $ / shares shares | Dec. 31, 2018 USD ($)
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Number of independent universities | item | 2 |
New York Code And Design Academy, Inc. |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Consideration payment |  | $ 0
Capella Merger |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Conversion ratio (in shares) | shares | 0.875 |
Total fair value of consideration transferred | $ 1,236,961,000 |
Capella Merger | Common Stock |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Fair value | $ 1,209,483,000 |
Number of common shares issued (in shares) | shares | 10,263,775 |
Market price (in dollars per share) | $ / shares | $ 117.84 |
Capella Merger | Equity-based awards |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |
Fair value | $ 27,478,000 |

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