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Significant Accounting Policies - Summary of Revenue Disaggregated by Sales Channel and Major Products and Services (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ 164,346 | $ 169,312 | $ 168,512 | $ 159,957 | $ 156,565 | $ 159,899 | $ 156,624 | $ 153,174 | $ 662,127 | $ 626,262 | $ 633,106
Direct |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 457,651 | 333,248 |
National Advertising |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 105,381 | 114,178 |
Other |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 16,156 | 15,854 |
Retail |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 579,188 | 463,280 | 462,776
Wholesale |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | [1] |  |  |  |  |  |  |  |  | 82,939 | 162,982 | $ 170,330
Online Subscription Advertising |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 507,993 | 483,026 |
Display Advertising |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 112,792 | 102,183 |
Pay Per Lead |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 30,757 | 31,727 |
Other |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | $ 10,585 | $ 9,326 |
[1] | For information related to related party transactions, see Note 15 (Related Party).

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