Acquisition and Divestiture (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Feb. 28, 2023
Business Combination [Line Items]
Gain from sale of divested operation		$ 0	$ 0	$ 135,410
Acquisition and integration charges		$ 0	973	$ 9,587
TalentNeuron
Business Combination [Line Items]
Sale of business, consideration					$ 161,100
Gartner Insights Products
Business Combination [Line Items]
Percent of outstanding membership interests acquired	100.00%
Purchase price	$ 7,900
Payment for contingent consideration liability, investing activities			$ 2,000