Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Reconciliation of Changes in Parent Company's Total Shareholders' Equity (Detail)

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Shareholders' Equity - Reconciliation of Changes in Parent Company's Total Shareholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Beginning Balance $ 2,549,490 $ 2,378,098 $ 2,147,719 $ 2,132,894 $ 2,378,098 $ 2,132,894
Net proceeds from issuance of common stock 148,325 180,529   21,466    
Earned portion of non-vested stock 1,467 1,453 1,071 1,124    
Stock dividend   0        
Carrying value less than redemption value on redeemed noncontrolling interest (13) (4)        
Adjustment to redemption value on noncontrolling redeemable Operating Partnership units (7,142) (2,358) 2,609 5,542 (9,498)  
Net income attributable to common shareholders 57,516 47,383 36,457 36,433 104,898 72,890
Amortization of terminated hedge included in AOCL 229 229 229 229    
Dividends (56,873) (55,840) (50,186) (49,969)    
Ending Balance 2,692,999 2,549,490 2,132,681 2,147,719 2,692,999 2,132,681
Common Stock Shares [Member]            
Beginning Balance 765 495 469 467 495 467
Net proceeds from issuance of common stock 16 18   2    
Earned portion of non-vested stock 0 0 0 0    
Stock dividend   252        
Carrying value less than redemption value on redeemed noncontrolling interest 0 0        
Adjustment to redemption value on noncontrolling redeemable Operating Partnership units 0 0 0 0    
Net income attributable to common shareholders 0 0 0 0    
Amortization of terminated hedge included in AOCL 0 0 0 0    
Dividends 0 0 0 0    
Ending Balance 781 765 469 469 781 469
Additional Paid-in Capital [Member]            
Beginning Balance 2,853,019 2,671,311 2,399,311 2,376,723 2,671,311 2,376,723
Net proceeds from issuance of common stock 148,309 180,511   21,464    
Earned portion of non-vested stock 1,467 1,453 1,071 1,124    
Stock dividend   (252)        
Carrying value less than redemption value on redeemed noncontrolling interest (13) (4)        
Adjustment to redemption value on noncontrolling redeemable Operating Partnership units 0 0 0 0    
Net income attributable to common shareholders 0 0 0 0    
Amortization of terminated hedge included in AOCL 0 0 0 0    
Dividends 0 0 0 0    
Ending Balance 3,002,782 2,853,019 2,400,382 2,399,311 3,002,782 2,400,382
Dividends in Excess of Net Income [Member]            
Beginning Balance (299,482) (288,667) (246,332) (238,338) (288,667) (238,338)
Net proceeds from issuance of common stock 0 0   0    
Earned portion of non-vested stock 0 0 0 0    
Stock dividend   0        
Carrying value less than redemption value on redeemed noncontrolling interest 0 0        
Adjustment to redemption value on noncontrolling redeemable Operating Partnership units (7,142) (2,358) 2,609 5,542    
Net income attributable to common shareholders 57,516 47,383 36,457 36,433    
Amortization of terminated hedge included in AOCL 0 0 0 0    
Dividends (56,873) (55,840) (50,186) (49,969)    
Ending Balance (305,981) (299,482) (262,670) (246,332) (305,981) (262,670)
Accumulated Other Comprehensive Income (Loss) [Member]            
Beginning Balance (4,812) (5,041) (5,729) (5,958) (5,041) (5,958)
Net proceeds from issuance of common stock 0 0   0    
Earned portion of non-vested stock 0 0 0 0    
Stock dividend   0        
Carrying value less than redemption value on redeemed noncontrolling interest 0 0        
Adjustment to redemption value on noncontrolling redeemable Operating Partnership units 0 0 0 0    
Net income attributable to common shareholders 0 0 0 0    
Amortization of terminated hedge included in AOCL 229 229 229 229    
Dividends 0 0 0 0    
Ending Balance $ (4,583) $ (4,812) $ (5,500) $ (5,729) $ (4,583) $ (5,500)