Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	Apr. 30, 2020
Cover [Abstract]
Entity Registrant Name	MILLER INDUSTRIES INC /TN/
Entity Central Index Key	0000924822
Document Type	10-Q
Entity Filer Category	Accelerated Filer
Current Fiscal Year End Date	--12-31
Document Period End Date	Mar. 31, 2020
Entity Current Reporting Status	Yes
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Interactive Data Current	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock Shares Outstanding		11,405,468