Earnings per Share - Schedule of Reconciliations of Numerators and Denominators Used to Compute Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net (loss) income	$ (164,438)	$ (5,240)	$ 67,854
Less: net (loss) income attributable to non-controlling interests	(10,359)	2,795	23,954
Net (loss) income attributable to Funko, Inc.	(154,079)	(8,035)	43,900
Add: Reallocation of net income attributable to non- controlling interests from the assumed exchange of common units of FAH, LLC for Class A common stock	0	0	0
Net (loss) income attributable to Funko, Inc. — diluted	$ (154,079)	$ (8,035)	$ 43,900
Denominator:
Weighted-average shares of Class A common stock outstanding — basic (in shares)	48,332,401	44,554,788	38,392,390
Add: Dilutive common units of FAH, LLC that are convertible into Class A common stock (in shares)	0	0	227,500
Add: Dilutive Funko, Inc. equity compensation awards (in shares)	0	0	1,990,728
Weighted-average shares of Class A common stock outstanding — diluted (in shares)	48,332,401	44,554,788	40,610,618
(Loss) earnings per share of Class A common stock — basic (in dollars per share)	$ (3.19)	$ (0.18)	$ 1.14
(Loss) earnings per share of Class A common stock — diluted (in dollars per share)	$ (3.19)	$ (0.18)	$ 1.08