Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 04, 2020	Jun. 28, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
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, Address Line One	101 Montgomery Street
Entity Address, Address Line Two	Suite 200
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94104
City Area Code	415
Local Phone Number	655-4580
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	TRNO
Security Exchange Name	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 Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 3,180,085,144
Entity Common Stock, Shares Outstanding (in shares)		67,388,281
Entity Central Index Key	0001476150
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Documents Incorporated by Reference	Part III of this Annual Report on Form 10-K incorporates by reference portions of Terreno Realty Corporation’s Proxy Statement for its 2020 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 2019 fiscal year pursuant to Regulation 14A.