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Related Party Transactions - Other (Details)
1 Months Ended 12 Months Ended
Aug. 31, 2016
ft²
property
Dec. 31, 2018
USD ($)
ft²
director
property
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Related Party Transaction [Line Items]        
Area of real estate property (in sqft) | ft²   10,100,000    
Number of directors (in directors) | director   1    
Affiliated Entity | Leased space rental        
Related Party Transaction [Line Items]        
Revenue from related parties       $ 200,000
Area of real estate property (in sqft) | ft²   3,074    
Number of properties (property) | property   1    
Affiliated Entity | Annualized rent revenue        
Related Party Transaction [Line Items]        
Revenue from related parties   $ 4,500,000 $ 5,800,000  
Undivided Interest        
Related Party Transaction [Line Items]        
Area of real estate property (in sqft) | ft² 5,351 647    
Chairman emeritus | Leased space rental        
Related Party Transaction [Line Items]        
Number of properties (property) | property 1      
Lease cancellation, period of notice 90 days      
Percentage of lease space occupied by Chairman emeritus and employee 15.00%      
Revenue from related parties, net of payment for pro rata share of leased space   $ 300,000 $ 400,000 100,000
Chairman emeritus | Purchase of miscellaneous furniture and artwork        
Related Party Transaction [Line Items]        
Revenue from related parties       $ 23,300