Cover Page - shares	3 Months Ended
	Mar. 31, 2024	May 02, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-37461
Entity Registrant Name	ALARM.COM HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-4247032
Entity Address, Address Line One	8281 Greensboro Drive
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Tysons
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	22102
City Area Code	877
Local Phone Number	389-4033
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	ALRM
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		50,188,716
Entity Central Index Key	0001459200
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q1
Amendment Flag	false