Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) |
Jan. 01, 2018 |
|---|---|
| Accounting Standards Update 2014-09 | Forecast | |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |
| Decrease in revenue, as a percent (less than) | 3.00% |
| X | ||||||||||
- Definition Increase (Decrease) In Subscription and Circulation Revenue, Percent No definition available.
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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