Quarterly Financial Data (Unaudited) - Schedule of Selected Quarterly Information (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Net Sales	$ 177,226,522	$ 157,103,841	$ 119,639,924	$ 102,602,602	$ 75,801,758	$ 67,990,907	$ 44,726,777	$ 27,913,163	$ 556,572,889	$ 216,432,605
(Loss) Income from operations	47,292,283	37,211,186	14,050,703	7,552,657	(6,111,030)	1,376,718	(9,326,730)	(13,629,660)	106,106,829	(27,690,702)	$ (26,340,158)
Net Income (loss) attributable to Green Thumb Industries Inc.	$ 22,464,807	$ 9,643,929	$ (12,909,505)	$ (4,206,264)	$ (14,070,509)	$ (14,590,793)	$ (20,892,049)	$ (9,563,056)	$ 14,992,967	$ (59,116,407)	$ (5,243,917)
Net Income (loss) per share – basic	$ 0.11	$ 0.04	$ (0.06)	$ (0.02)	$ (0.07)	$ (0.07)	$ (0.11)	$ (0.06)	$ 0.07	$ (0.31)	$ (0.04)
Net Income (loss) per share – diluted	$ 0.11	$ 0.04	$ (0.06)	$ (0.02)	$ (0.07)	$ (0.07)	$ (0.11)	$ (0.06)	$ 0.07	$ (0.31)	$ (0.04)
Weighted average number of common shares outstanding - basic	213,249,477	211,990,405	209,902,732	208,468,356	207,666,666	204,709,085	182,261,947	167,171,886	210,988,259	190,602,400	130,102,523
Weighted average number of common shares outstanding - diluted	217,178,771	214,212,292	209,902,732	208,468,356	207,666,666	204,709,085	182,261,947	167,171,886	212,531,188	190,602,400	130,102,523