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Goodwill and Intangible Assets - Intangibles Impairment (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |
Impairment of goodwill | $ 0 |  |  | $ 13,944,000 | $ 0 | $ 0
Finite-lived intangible assets | 142,944,000 |  |  | 142,944,000 |  |
Amortization expenses |  |  |  | 25,694,000 |  |
Impairment of intangible assets |  |  |  |  | 0 | $ 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
2019 | 55,333,000 |  |  | 55,333,000 |  |
2020 | 55,333,000 |  |  | 55,333,000 |  |
2021 | 32,278,000 |  |  | 32,278,000 |  |
Net | 142,944,000 |  |  | 142,944,000 |  |
New York Code And Design Academy, Inc. |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |
Impairment of goodwill |  | $ 11,100,000 | $ 2,800,000 | 13,900,000 |  |
Trade names |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |
Indefinite-lived intangible assets | 185,400,000 |  |  | 185,400,000 | 7,260,000 |
Trade names | New York Code And Design Academy, Inc. |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |
Impairment of intangible assets | 300,000 | $ 2,000,000 | $ 3,400,000 |  |  |
Capella University |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |
Impairment of intangible assets | 0 |  |  |  |  |
Non-Degree Programs |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |
Impairment of goodwill |  |  |  | $ 13,944,000 |  |
Strayer University |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |
Impairment of intangible assets | 0 |  |  |  |  |
Student relationships |  |  |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |  |  |
Useful life - acquired |  |  |  | 3 years |  |
Finite-lived intangible assets | 142,944,000 |  |  | $ 142,944,000 | 0 |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Net | $ 142,944,000 |  |  | $ 142,944,000 | $ 0 |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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