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Organization - Narrative (Details)
ft² in Millions
 9 Months Ended
Sep. 30, 2018
ft²
property
Sep. 30, 2017
Operations [Line Items]    
Number of properties (property) | property 336  
Rentable square feet (sqft) | ft² 26.2  
Occupancy rate 99.50%  
Weighted average remaining lease term 8 years 7 months  
United States    
Operations [Line Items]    
Entity-wide revenue percentage 52.90% 48.90%
Europe    
Operations [Line Items]    
Percentage of portfolio investments 47.10%