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Investments and other assets - Narrative (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2017 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments |  |  | $ 27,650 | $ 41,420
After-tax gain on sale of equity method investment |  |  | 19,700 |
Gain on other equity investment |  |  | 5,900 |
Career Builder |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment retained after disposal (as a percent) | 17.00% |  |  |
Equity method investment retained after disposal, ownership Interest after disposal, diluted (as a percent) | 10.00% |  |  |
Equity method investments |  |  | 7,900 | $ 12,400
Captivate |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Proceeds from sale of equity method investment |  | $ 16,200 |  |
Pre-tax gain on sale of equity method investment |  | 12,200 |  |
After-tax gain on sale of equity method investment |  | $ 9,200 |  |
Other Equity Investments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gain on other equity investment |  |  | $ 5,900 |

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