Shareholders' Equity - Reconciliation of Changes in Parent Company's Total Shareholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Beginning Balance	$ 3,474,695	$ 3,378,999	$ 2,549,490	$ 2,378,098	$ 3,378,999	$ 2,378,098
Net proceeds from issuance of common stock	7,865	92,771	148,325	180,529
Exercise of stock options		173
Earned portion of non-vested stock	1,743	1,661	1,467	1,453
Stock dividend				0
Carrying value less than redemption value on redeemed noncontrolling interest	(2)		(13)	(4)
Adjustment to redemption value on noncontrolling redeemable Operating Partnership Units	27,930	10,924	(7,142)	(2,358)
Net income attributable to common shareholders	92,264	73,575	57,516	47,383	165,839	104,898
Amortization of terminated hedge included in AOCL	229	229	229	229
Dividends	(84,363)	(83,637)	(56,873)	(55,840)
Ending Balance	3,520,361	3,474,695	2,692,999	2,549,490	3,520,361	2,692,999
Common Stock Shares [Member]
Beginning Balance	843	836	765	495	836	495
Net proceeds from issuance of common stock	1	7	16	18
Exercise of stock options		0
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	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	844	843	781	765	844	781
Additional Paid-in Capital [Member]
Beginning Balance	3,791,598	3,697,000	2,853,019	2,671,311	3,697,000	2,671,311
Net proceeds from issuance of common stock	7,864	92,764	148,309	180,511
Exercise of stock options		173
Earned portion of non-vested stock	1,743	1,661	1,467	1,453
Stock dividend				(252)
Carrying value less than redemption value on redeemed noncontrolling interest	(2)		(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	3,801,203	3,791,598	3,002,782	2,853,019	3,801,203	3,002,782
Dividends in Excess of Net Income [Member]
Beginning Balance	(313,851)	(314,713)	(299,482)	(288,667)	(314,713)	(288,667)
Net proceeds from issuance of common stock	0	0	0	0
Exercise of stock options		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	0
Adjustment to redemption value on noncontrolling redeemable Operating Partnership Units	27,930	10,924	(7,142)	(2,358)
Net income attributable to common shareholders	92,264	73,575	57,516	47,383
Amortization of terminated hedge included in AOCL	0	0	0	0
Dividends	(84,363)	(83,637)	(56,873)	(55,840)
Ending Balance	(278,020)	(313,851)	(305,981)	(299,482)	(278,020)	(305,981)
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance	(3,895)	(4,124)	(4,812)	(5,041)	(4,124)	(5,041)
Net proceeds from issuance of common stock	0	0	0	0
Exercise of stock options		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	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	$ (3,666)	$ (3,895)	$ (4,583)	$ (4,812)	$ (3,666)	$ (4,583)