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Business Combinations - Revenue and Net Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 263,772 | $ 241,747 | $ 245,110 | $ 246,508 | $ 242,103 | $ 160,945 | $ 114,668 | $ 116,469 | $ 997,137 | $ 634,185 | $ 454,851
Net income (loss) | $ 28,537 | $ 16,692 | $ 24,409 | $ 11,500 | $ 22,455 | $ (52,781) | $ 5,188 | $ 9,467 | $ 81,138 | (15,671) | $ 20,612
Capella Education Company |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 160,400 |
Net income (loss) |  |  |  |  |  |  |  |  |  | $ (39,600) |

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