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Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Equity [Line Items] |  |
Operating partnership units outstanding | 369,176 | 369,176
Common shares, par value | $ 0.10 | $ 0.10
Class A Cumulative Redeemable Preferred Shares [Member] |  |
Schedule Of Equity [Line Items] |  |
Cumulative redeemable preferred shares | $ 175,000 | $ 0
Preferred stock dividend rate | 6.375% |
Cumulative redeemable preferred shares, liquidation value | $ 500 |
Preferred Shares, without par value | 750,000 |
Class A Depositary Share [Member] |  |
Schedule Of Equity [Line Items] |  |
Cumulative redeemable preferred shares, liquidation value | $ 25 |
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 |
Redemption date restrictions for depositary shares | Apr. 09, 2018 |
Class J 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 Shares, without par value | 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 Shares, without par value | 750,000 |
Class K Cumulative Redeemable Preferred Shares [Member] |  |
Schedule Of Equity [Line Items] |  |
Preferred Shares, without par value | 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 |

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