Document and Entity Information Document - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2020	Feb. 19, 2021	Jun. 30, 2020
Entity Information [Line Items]
Title of 12(b) Security	Common stock, $0.01 par value
Entity Incorporation, State or Country Code	DE
Document Annual Report	true
Entity Registrant Name	TRIMAS CORPORATION
Entity Address, Address Line One	38505 Woodward Avenue
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	Bloomfield Hills
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48304
City Area Code	248
Local Phone Number	631-5450
Entity Central Index Key	0000842633
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Entity File Number	001-10716
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		43,178,165
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Public Float			$ 1.0
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Transition Report	false
Entity Tax Identification Number	38-2687639
Trading Symbol	TRS
Security Exchange Name	NASDAQ