Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Dec. 15, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Annual Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	000-56021
Entity Registrant Name	ACREAGE HOLDINGS, INC.
Entity Incorporation, State or Country Code	A1
Entity Tax Identification Number	98-1463868
Entity Address, Address Line One	450 Lexington Avenue, #3308
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10163
City Area Code	646
Local Phone Number	600-9181
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Central Index Key	0001762359
Document Fiscal Year Focus	2020
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Amendment Flag	false
Class D Subordinate Voting Shares
Entity Information [Line Items]
Title of 12(g) Security	Class D Subordinate Voting Shares, no par value
Entity Common Stock, Shares Outstanding		30,626,930
Class E Subordinate Voting Shares
Entity Information [Line Items]
Title of 12(g) Security	Class E Subordinate Voting Shares, no par value
Entity Common Stock, Shares Outstanding		71,460,986