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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule Of Equity [Line Items] |  |  |
Operating partnership units outstanding | 369,176 | 1,412,366 |
Write-off of preferred share original issuance costs | $ 0 | $ 1,943 | $ 5,246
Common shares, par value | $ 0.10 | $ 0.10 |
Class J depositary share [Member] |  |  |
Schedule Of Equity [Line Items] |  |  |
Cumulative redeemable preferred shares liquidation value | $ 500 |  |
Redemption date restrictions for depositary shares | Aug. 01, 2017 |  |
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 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] |  |  |
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 |  |
Preferred Shares [Member] |  |  |
Schedule Of Equity [Line Items] |  |  |
Fees paid for issuance of shares |  |  | 400
Common Shares [Member] |  |  |
Schedule Of Equity [Line Items] |  |  |
Fees paid for issuance of shares |  | $ 200 | $ 700
Chicago, IL [Member] |  |  |
Schedule Of Equity [Line Items] |  |  |
Operating Partnership Units Issued |  | 1,000,000 |

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- Definition The number of shares issued as [noncash or part noncash] consideration for a business or asset acquired. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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