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Subsequent Events - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 2 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 09, 2016 $ / shares | Feb. 24, 2016 USD ($) Assets | Dec. 31, 2015 Property
Subsequent Event [Line Items] |  |  |
Number of operating assets sold | Property |  |  | 29
Compensation fully earned and vested description |  |  | The 2013 VSEP awards earned resulted in the granting of common shares of the Company to participants on several measurement dates through December 31, 2015, and are subject to an additional service-based vesting schedule. As a result, in general, the total compensation available to participants under the 2013 VSEP will be fully earned and vested on December 31, 2019.
2016 VSEP [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Compensation fully earned and vested description |  |  | The 2016 VSEP awards, if earned, may result in the granting of common shares of the Company and time-vested restricted stock units (“RSUs”) to participants on future measurement dates over three years, subject to an additional time-based vesting schedule. As a result, in general, the total compensation available to participants under the 2016 VSEP, if any, will be fully earned only after approximately seven years (the three-year performance period and the final four-year time-based vesting period for RSUs).
Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of operating assets sold |  | 16 |
Number of non-operating assets sold |  | 2 |
Aggregate sale price of operating and non-operating assets | $ |  | $ 218.7 |
Subsequent Event [Member] | 2016 VSEP [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Vesting Period | 7 years |  |
Subsequent Event [Member] | 2016 VSEP [Member] | Minimum [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Share price for vesting | $ / shares | $ 17.41 |  |
Subsequent Event [Member] | 2016 VSEP [Member] | Maximum [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Share price for vesting | $ / shares | $ 25.35 |  |
Subsequent Event [Member] | 2016 VSEP [Member] | Performance Period [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Vesting Period | 3 years |  |
Subsequent Event [Member] | 2016 VSEP [Member] | Additional Vesting [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Vesting Period | 4 years |  |
Subsequent Event [Member] | Joint Venture [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of operating assets sold |  | 11 |

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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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