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Equity (Exchangeable Shares and Series F and Series G Preferred Stock) - Additional Information (Detail) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Class of Stock [Line Items]      
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   50,000  
Number of shares of Common stock received for each exchangeable share   1  
Exchangeable shares exchanged for common stock 255,647    
Common stock, shares outstanding 144,552,571 144,552,571 152,907,166
Series F Preferred Stock [Member]      
Class of Stock [Line Items]      
Number of preferred Stock issued to voting trust 1 1 1
Series G Preferred Stock [Member]      
Class of Stock [Line Items]      
Number of preferred Stock issued to voting trust 1 1 1
Exchangeable Shares [Member]      
Class of Stock [Line Items]      
Common stock, shares outstanding 6,620,395 6,620,395 6,876,042
Series F- and Series G- Preferred Stock [Member]      
Class of Stock [Line Items]      
Exchangeable stock shares outstanding 3,949,929 3,949,929