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Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
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Mar. 13, 2020 | 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
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 124,269 | $ 108,596 | $ 128,183 | $ 100,649 | $ 98,583 | $ 84,890 | $ 96,353 | $ 77,749 | $ 461,697 | $ 357,575 | $ 337,673
Income (loss) from operations |  | $ 6,827 | $ (1,640) | $ 4,622 | $ (10,884) | $ 8,744 | $ 4,942 | $ 11,027 | $ (2,288) | $ (1,075) | $ 22,425 | $ 27,549
Subsequent Event [Member] | Summit Update [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent event, date | Mar. 13, 2020 |  |  |  |  |  |  |  |  |  |  |
Description of subsequent event | Due to considerations of the effect of the novel coronavirus, the Company announced on March 13, 2020 that it will be holding its SiriusDecisions Summit 2020, its single largest event, as a virtual event during its originally scheduled timeframe in May 2020. The Company estimates the impact of holding the event as a virtual event, as compared to a live event, will reduce revenues by $7.0 million to $9.0 million and will reduce operating income by $4.0 million to $6.0 million. |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Minimum [Member] | Summit Update [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 7,000 |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations | 4,000 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] | Summit Update [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 9,000 |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations | $ 6,000 |  |  |  |  |  |  |  |  |  |  |

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