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Equity - Exchangeable Shares and Series F and Series G Preferred Stock (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
shares
Sep. 30, 2016
shares
Sep. 30, 2017
Acquisition
shares
Sep. 30, 2016
shares
Dec. 31, 2016
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    
Common stock, shares outstanding (in shares) 151,206,729   151,206,729   144,710,773
Series F Preferred Stock          
Class of Stock [Line Items]          
Preferred stock, shares issued (in shares) 1   1   1
Preferred stock, shares outstanding (in shares) 1   1   1
Series G Preferred Stock          
Class of Stock [Line Items]          
Preferred stock, shares issued (in shares) 1   1   1
Preferred stock, shares outstanding (in shares) 1   1   1
Exchangeable Shares For Common Stock          
Class of Stock [Line Items]          
Exchangeable shares exchanged for common stock (in shares) 0 300,000 2,500,000 300,000  
Exchangeable Shares          
Class of Stock [Line Items]          
Common stock, shares outstanding (in shares) 3,986,112   3,986,112   6,515,453
Exchangeable Shares Associated With Series F And Series G Preferred Stock [Member]          
Class of Stock [Line Items]          
Common stock, shares outstanding (in shares) 3,900,000   3,900,000