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Earnings Per Common Share - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Anti-dilutive securities excluded from computation of earnings per common share (in shares) 8,484,961 1,507,888 8,413,687 1,512,657  
Average share price (in dollars per share) $ 92.95 $ 105.06 $ 98.49 $ 100.63  
Exchangeable senior notes, net $ 573,154,000   $ 573,154,000   $ 569,513,000
Exchangeable Senior Notes 3.125% due 2035 (the 2015 Notes)          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Exchangeable senior notes, net $ 575,000,000   $ 575,000,000    
Debt stated interest rate 3.125%   3.125%    
Exchange price (in dollars per share) $ 91.16   $ 91.16    
Shares related to the Notes included in the computation for diluted earnings per share (in shares) 121,283 757,811 121,283 757,811  
Series A Units          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Exchangeable preferred operating partnership units settled in cash, minimum $ 101,700,000   $ 101,700,000    
Stock Options          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Anti-dilutive securities excluded from computation of earnings per common share (in shares) 0 0 0 0