Non-controlling Interests - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended									9 Months Ended		12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Jun. 30, 2019
Minority Interest [Line Items]
Income tax expense	$ 2,865	$ 1,429	$ 2,770	$ 1,906	$ 192	$ 563	$ 655	$ 22	$ 589	$ 6,464	$ 2,661
Class A Common Stock [Member]
Minority Interest [Line Items]
Common stock, shares outstanding	34,658,000		24,960,000	24,701,000	23,365,000		23,338,000			34,658,000	24,701,000	24,960,000	30,214,000
Funko Acquisition Holdings, L.L.C. [Member]
Minority Interest [Line Items]
Ownership percentage										69.10%		50.20%
Equity-based compensation	$ 3,100			$ 2,900						$ 8,100	$ 3,600
Income tax expense	$ 2,300			$ 1,200						$ 4,800	$ 1,000
Funko Acquisition Holdings, L.L.C. [Member] | Class A Common Stock [Member]
Minority Interest [Line Items]
Common stock, shares outstanding	34,700,000		25,000,000							34,700,000		25,000,000