Non-Controlling Interests, Common Shares and Common Shares in Treasury and Preferred Shares - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Equity [Line Items]
Operating partnership units outstanding	140,633	140,633
Common shares, issued	13,225,000
Net proceeds from issuance of common shares	$ 194,598	$ 0	$ 0
Common shares, par value	$ 0.10	$ 0.10
Stock repurchase program authorized amount		$ 100,000
Shares repurchased	1,200,000	3,100,000
Shares repurchased at cost	$ 14,069	$ 36,341
Preferred stock redemption premium	7,176	$ 0	$ 0
Class J Cumulative Redeemable Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred stock, liquidation preference, value	$ 200,000
Preferred stock dividend rate	6.50%
Cumulative redeemable preferred shares, liquidation value	$ 500
Per share price of depositary share	25.00
Redeemable preferred stock dividend per share prorated to redemption date	3.7917
Redeemable preferred stock dividend per depositary share prorated to redemption date	$ 0.1896
Preferred stock redemption premium	$ 7,200
Class A Depositary Share [Member]
Schedule Of Equity [Line Items]
Redemption date restrictions for depositary shares	Jun. 05, 2022
Class K Depositary Share [Member]
Schedule Of Equity [Line Items]
Cumulative redeemable preferred shares, liquidation value	$ 500
Class A Cumulative Redeemable Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred stock dividend rate	6.375%	6.375%
Cumulative redeemable preferred shares, liquidation value	$ 500	$ 500
Preferred Shares, without par value	750,000	750,000
Class B Cumulative Redeemable Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred Shares, without par value	750,000
Class C Cumulative Redeemable Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred Shares, without par value	750,000
Class D Cumulative Redeemable Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred Shares, without par value	750,000
Class E Cumulative Redeemable Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred Shares, without par value	750,000
Class F Cumulative Redeemable Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred Shares, without par value	750,000
Class G Cumulative Redeemable Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred Shares, without par value	750,000
Class H Cumulative Redeemable Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred Shares, without par value	750,000
Class I Cumulative Redeemable Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred Shares, without par value	750,000
Class J Cumulative Redeemable Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred stock dividend rate		6.50%
Cumulative redeemable preferred shares, liquidation value		$ 500
Preferred Shares, without par value	750,000	750,000
Class K Cumulative Redeemable Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred stock dividend rate	6.25%	6.25%
Cumulative redeemable preferred shares, liquidation value	$ 500	$ 500
Preferred Shares, without par value	750,000	750,000
Non-Cumulative Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred Shares, without par value	750,000
Cumulative Voting Preferred Shares [Member]
Schedule Of Equity [Line Items]
Preferred Shares, without par value	2,000,000