Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity Registrant Name	MILLER INDUSTRIES INC /TN/
Entity File Number	001-14124
Entity Incorporation, State or Country Code	TN
Entity Tax Identification Number	62-1566286
Entity Address, Address Line One	8503 Hilltop Drive
Entity Address, City or Town	Ooltewah
Entity Address, State or Province	TN
Entity Address, Postal Zip Code	37363
City Area Code	423
Local Phone Number	238-4171
Title of 12(b) Security	Common Stock
Trading Symbol	MLR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding		11,405,468
Entity Central Index Key	0000924822
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false