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Cover Page - shares
3 Months Ended
Mar. 31, 2020
May 01, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2020  
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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   67,695,805
Entity Central Index Key 0001476150  
Amendment Flag false  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31