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Equity - Exchangeable Shares and Preferred Stock (Details)
 3 Months Ended 6 Months Ended
Mar. 31, 2019
shares
Jun. 30, 2019
Acquisition
shares
Dec. 31, 2018
shares
Oct. 05, 2017
shares
Class of Stock [Line Items]        
Number of shares of common stock received for each exchangeable share (in shares)   1    
Minimum number of shares that can be exchanged by exchangeable shareholders unless the number of remaining exchangeable shares registered in the name of the holder is less (in shares)   50,000    
Number of business acquisitions having issuances of preferred stock | Acquisition   2    
Series F Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, shares issued (in shares)       1
Series G Preferred Stock        
Class of Stock [Line Items]        
Preferred stock, shares issued (in shares)   0 1 1
Exchangeable Shares For Common Stock        
Class of Stock [Line Items]        
Exchangeable shares exchanged for common stock (in shares) 400,000      
Exchangeable Shares        
Class of Stock [Line Items]        
Common stock, shares outstanding (in shares)   36,183 486,112