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Earnings Per Common Share - Schedule of Computation (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]    
Net income attributable to common stockholders $ 108,179 $ 94,770
Earnings and dividends allocated to participating securities (163) (167)
Earnings for basic computations 108,016 94,603
Earnings and dividends allocated to participating securities 163 0
Income allocated to noncontrolling interest - Preferred Operating Partnership Units and Operating Partnership Units 6,171 5,429
Fixed component of income allocated to noncontrolling interest - Preferred Operating Partnership (Series A Units) (572) (572)
Net income for diluted computations $ 113,778 $ 99,460
Weighted average common shares outstanding:    
Average number of common shares outstanding - basic (in shares) 129,288,629 127,037,247
OP Units (in shares) 5,919,705 5,960,981
Preferred Units (in shares) 875,480 875,480
Unvested restricted stock awards included for treasury stock method (in shares) 211,602 0
Shares related to exchangeable senior notes and dilutive stock options (in shares) 844,144 416,008
Average number of common shares outstanding - diluted (in shares) 137,139,560 134,289,716
Earnings per common share    
Basic (in dollars per share) $ 0.84 $ 0.74
Diluted (in dollars per share) $ 0.83 $ 0.74