Net (Loss) Income Per Share - Schedule of Computation of Basic and Diluted Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Numerator:
Net (loss) income from continuing operations	$ (7,426)	$ 2,512	$ (30,514)	$ (29,812)
Net loss from discontinued operations, net of tax	0	(378)	0	(11,196)
Less: net income attributable to noncontrolling interests	9	45	412	119
Net (loss) income attributable to holders of Class A and Class B common stock	(7,435)	2,089	(30,926)	(41,127)
Amounts attributable to BuzzFeed, Inc. for net (loss) income per common share, basic and diluted:
Net (loss) income from continuing operations, basic	(7,435)	2,467	(30,926)	(29,931)
Net (loss) income from continuing operations, diluted	(7,435)	2,467	(30,926)	(29,931)
Net loss from discontinued operations, net of tax, basic	0	(378)	0	(11,196)
Net loss from discontinued operations, net of tax, diluted	0	(378)	0	(11,196)
Net (loss) income attributable to holders of Class A and Class B common stock	(7,435)	2,089	(30,926)	(41,127)
Net (loss) income attributable to BuzzFeed, Inc., diluted	$ (7,435)	$ 2,089	$ (30,926)	$ (41,127)
Denominator:
Weighted average common shares outstanding, basic (in shares)	37,212	37,949	37,986	37,181
Weighted average common shares outstanding, diluted (in shares)	37,212	38,608	37,986	37,181
Net (loss) income per common share, basic:
Continuing operations (in dollars per share)	$ (0.20)	$ 0.07	$ (0.81)	$ (0.81)
Discontinued operations (in dollars per share)	0	(0.01)	0	(0.30)
Net (loss) income per common share, basic, attributable to BuzzFeed, Inc. (in dollars per share)	(0.20)	0.06	(0.81)	(1.11)
Net (loss) income per common share, diluted
Continuing operations (in dollars per share)	(0.20)	0.06	(0.81)	(0.81)
Discontinued operations (in dollars per share)	0	(0.01)	0	(0.30)
Net loss per common share, diluted, attributable to BuzzFeed, Inc., (in dollars per share)	$ (0.20)	$ 0.05	$ (0.81)	$ (1.11)