Variable Interest Entities - Schedule of Variable Interest Entities (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Variable Interest Entity [Line Items]
Current assets	$ 159,059,237		$ 159,059,237		$ 109,062,611
Current liabilities	105,898,809		105,898,809		111,367,255
Chesapeake Alternatives LLC [member]
Variable Interest Entity [Line Items]
Equity attributable to noncontrolling interests	298,252		298,252		350,206
Equity attributable to Green Thumb Industries Inc.	10,457,386		10,457,386		6,645,263
Revenues	5,684,349	$ 4,369,436	14,792,710	$ 12,458,427
Net income (loss) attributable to noncontrolling interests	26,134	1,807,394	206,929	2,244,546
Net income (loss) attributable to Green Thumb Industries Inc.	1,033,650	(971,880)	3,812,121
Net income (loss)	1,059,784	835,514	4,019,050	2,244,546
Chesapeake Alternatives LLC [member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Current assets	29,728,652		29,728,652		19,455,533
Non-current assets	3,041,401		3,041,401		22,384,663
Current liabilities	21,228,691		21,228,691		14,219,204
Non-current liabilities	785,724		785,724		1,169,989
Illinois Disp LLC [member]
Variable Interest Entity [Line Items]
Equity attributable to noncontrolling interests	2,309,983		2,309,983		2,089,071
Equity attributable to Green Thumb Industries Inc.	2,309,983		2,309,983		2,089,070
Revenues	5,224,583	1,620,065	13,170,514	4,174,045
Net income (loss) attributable to noncontrolling interests	897,494	185,930	2,170,912	506,972
Net income (loss) attributable to Green Thumb Industries Inc.	897,494	185,931	2,170,913	506,972
Net income (loss)	1,794,988	371,860	4,341,825	1,013,943
Illinois Disp LLC [member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Current assets	2,489,118		2,489,118		1,381,716
Non-current assets	3,752,645		3,752,645		3,083,659
Current liabilities	898,661		898,661		149,498
Non-current liabilities	473,136		473,136		137,736
Other Non material VIEs [member]
Variable Interest Entity [Line Items]
Equity attributable to noncontrolling interests	85,561		85,561		(22,488)
Equity attributable to Green Thumb Industries Inc.	2,619,001		2,619,001		2,270,598
Revenues	2,695,781	689,097	6,778,501	2,373,042
Net income (loss) attributable to noncontrolling interests	185,452	(1,624,850)	319,511	(2,307,097)
Net income (loss) attributable to Green Thumb Industries Inc.	294,969	1,059,653	661,341
Net income (loss)	480,421	$ (565,197)	980,852	$ (2,307,097)
Other Non material VIEs [member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Current assets	2,261,685		2,261,685		1,352,935
Non-current assets	2,353,991		2,353,991		2,534,297
Current liabilities	1,108,292		1,108,292		783,682
Non-current liabilities	$ 802,823		$ 802,823		$ 855,440