Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.19.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2019
Apr. 26, 2019
Entity Information [Line Items]    
Entity Registrant Name CORPORATE OFFICE PROPERTIES TRUST  
Entity Central Index Key 0000860546  
Document Type 10-Q  
Document Period End Date Mar. 31, 2019  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   111,917,479
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Entity Small Business false  
Entity Emerging Growth Company false  
Corporate Office Properties, L.P.    
Entity Information [Line Items]    
Entity Registrant Name CORPORATE OFFICE PROPERTIES, L.P.  
Entity Central Index Key 0001577966  
Document Type 10-Q  
Document Period End Date Mar. 31, 2019  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Entity Small Business false  
Entity Emerging Growth Company false