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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, 2018 | Dec. 31, 2017
Schedule Of Equity [Line Items] |  |
Reduction in non-controlling interest related to sale of interest in consolidated joint venture | $ 709 |
Operating partnership units outstanding | 140,633 | 184,588
Common shares, par value | $ 0.10 | $ 0.10
Shares repurchased at cost | $ 36,341 |
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 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] |  |
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] |  |
Cumulative redeemable preferred shares, liquidation value | $ 500 | $ 500
Preferred Shares, without par value | 750,000 | 750,000
Class K Cumulative Redeemable Preferred Shares [Member] |  |
Schedule Of Equity [Line Items] |  |
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 |
Common Share Repurchase Program [Member] |  |
Schedule Of Equity [Line Items] |  |
Shares repurchased | 3,100,000 |
Shares repurchased at cost | $ 36,300 |
Joint Venture Partner [Member] |  |
Schedule Of Equity [Line Items] |  |
Reduction in non-controlling interest related to sale of interest in consolidated joint venture | 2,100 |
Loss on sale of interest in consolidated joint venture | $ 200 |

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