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Owners' Equity - Operating Partnership (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Aug. 31, 2015
Common Shares        
Common units outstanding (in shares) 3,520,205 3,520,205    
Units issued in connection with acquisitions (in shares) 0 0 0  
Share Repurchase        
Share repurchase, value     $ 40,896,000  
Liberty Property Limited Partnership        
Common Shares        
Common units outstanding (in shares) 3,520,205 3,520,205    
Closing price of the common shares $ 147,400,000      
Units issued in connection with acquisitions (in shares) 0 0 0  
Share Repurchase        
Share repurchase, value     $ 40,896,000  
Liberty Property Limited Partnership | Common units        
Dividend Reinvestment and Share Purchase Plan        
Dividend reinvestment plan (in shares) 36,807 42,366 56,426  
Share Repurchase        
Stock repurchase program, authorized amount       $ 250,000,000
Share repurchase (in shares)   0 1,400,000  
Share repurchase, value     $ 40,900,000