Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 07, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-34603
Entity Registrant Name	Terreno Realty Corporation
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	27-1262675
Entity Address, Street	10500 NE 8th Street
Entity Address, Suite	Suite 301
Entity Address, City	Bellevue
Entity Address, State	WA
Entity Address, Postal Zip Code	98004
City Area Code	415
Local Phone Number	655-4580
Title of each class	Common Stock, $0.01 par value per share
Trading Symbol(s)	TRNO
Name of each exchange on which registered	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 4,439,234,661
Entity Common Stock, Shares Outstanding		75,494,716
Documents Incorporated by Reference	Documents Incorporated by ReferencePart III of this Annual Report on Form 10-K incorporates by reference portions of Terreno Realty Corporation’s Proxy Statement for its 2022 Annual Meeting of Stockholders, which the registrant anticipates will be filed with the Securities and Exchange Commission no later than 120 days after the end of its 2021 fiscal year pursuant to Regulation 14A.
Entity Central Index Key	0001476150
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY