v3.25.2
Cover Page - shares
 6 Months Ended
Jun. 30, 2025
Jul. 25, 2025
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-37994  
Entity Registrant Name JBG SMITH PROPERTIES  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 81-4307010  
Entity Address, Address Line One 4747 Bethesda Avenue  
Entity Address, Address Line Two Suite 200  
Entity Address, City or Town Bethesda  
Entity Address, State or Province MD  
Entity Address, Postal Zip Code 20814  
City Area Code 240  
Local Phone Number 333-3600  
Title of 12(b) Security Common Shares, par value $0.01 per share  
Trading Symbol JBGS  
Security Exchange Name NYSE  
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  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   61,724,341
Entity Central Index Key 0001689796  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false