Equity and Noncontrolling Interest - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions			12 Months Ended
	Sep. 23, 2019	Sep. 17, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 17, 2019	Sep. 30, 2019
Class of Stock [Line Items]
Income attributable to noncontrolling interests			$ 12,473	$ 12,505	$ 12,411
Series C Cumulative Preferred Stock
Class of Stock [Line Items]
Depositary shares outstanding (in shares)				4.2
Liquidation preference (in usd per share)				$ 25.00
Annual dividend on depositary shares (in usd per share)				$ 1.71875
Preferred stock gross redemption price (in dollars per share)						$ 25.00
Preferred stock net redemption price (in dollars per share)						$ 25.07638
Percentage of redeemable preferred stock				6.875%
Depository shares to cumulative redeemable preferred stock ratio			1.00%
Dividend rate on preferred stock			6.875%
Series D Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
Depositary shares outstanding (in shares)			3.0
Liquidation preference (in usd per share)			$ 25.00
Annual dividend on depositary shares (in usd per share)			$ 1.53125
Percentage of redeemable preferred stock			6.125%
Depository shares to cumulative redeemable preferred stock ratio			1.00%
Dividend rate on preferred stock			6.125%
Series E Cumulative Redeemable Preferred Stock
Class of Stock [Line Items]
Depositary shares outstanding (in shares)	0.4	4.0
Liquidation preference (in usd per share)			$ 25.00				$ 25.00
Annual dividend on depositary shares (in usd per share)			$ 1.50
Percentage of redeemable preferred stock		6.00%	6.00%
Proceeds from shares sold	$ 9,500	$ 96,800