Accelerated Amortization Expense

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- Definition

Accrued Amortization Expense Relating To Employee Separation

+ References

No definition available.

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- Definition

Aggregate Fair Value of Awards on Grant Date

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No definition available.

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- Definition

Aggregate Fair Value Of Restricted Shares Granted To Employees On Grant Date

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No definition available.

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- Definition

Aggregate Fair Value Per Share Based On Monte Carlo Simulation

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No definition available.

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- Definition

Common Stock Share Average Price On Grant Date

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No definition available.

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- Definition

Fair Value Of Non Employee Trustee Awards Granted

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No definition available.

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- Definition

Fair Value Of Restricted Share Based Employee Compensation Vested

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No definition available.

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- Definition

Non Employee Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition

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No definition available.

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- Definition

Number Of Days For Additional Acquisition Of Restricted Share Units

+ References

No definition available.

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- Definition

Restricted Share Compensation Cost Weighted Average Time To Vest

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No definition available.

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- Definition

Share Based Compensation Arrangement By Time Based Payment Award Vesting Period

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No definition available.

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- Definition

Share Based Compensation Common Stock Shares Authorized For Issuance

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No definition available.

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- Definition

Share Based Compensation Restricted Share Unit Award Future Compensation Expense

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No definition available.

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- Definition

Unrecognized Compensation Expense

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No definition available.

+ Details

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ 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 (h)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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 (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Net number of share options (or share units) granted during the period.

+ 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 (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Share Based Compensation (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	10 Months Ended	12 Months Ended
	Feb. 23, 2016	Feb. 29, 2016	Feb. 27, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount					$ 0.2	$ 0.1	$ 0.1
Aggregate fair value of restricted shares					4.0	4.3	4.1
Unrecognized compensation cost related to unvested share based compensation					$ 7.9
Weighted average period					9 months 18 days
Fair value of shares vested					$ 3.7	6.0	5.4
Number of days for acquisition of RSUs					20 days
Aggregate fair value of awards					$ 0.6	$ 0.5	$ 0.6
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period					134,733	345,344	341,710
Unrecognized compensation expense					$ 0.2
Grants in period (in shares)					5,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of restricted shares	$ 4.2
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	226,521			125,447
Restricted Shares Awarded to Non-Employee Trustees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate compensation expense					$ 6.3	$ 8.5	$ 7.3
Accrued amortization relating to employee separation					$ 0.2	1.5	0.7
2003 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total remaining number of common shares to be issued					1,158,149
Time Based Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate compensation expense					$ 3.9	$ 4.9	$ 4.3
Number of awards granted					169,131	225,978	222,664
Common share per share on the date of grant					$ 23.55	$ 19.23	$ 18.29
Accelerated amortization relating to employee separation					$ 0.2	$ 0.8	$ 0.5
Time Based Vesting [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vest over period					1 year
Time Based Vesting [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vest over period					3 years
Restricted Share Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate compensation expense					$ 1.8	$ 2.8	2.3
Number of awards granted			112,898		94,014	127,353
Accelerated amortization relating to employee separation					$ 0.2	$ 0.7
Aggregate fair value of awards					$ 2.1	$ 2.2	$ 2.0
Aggregate fair values of RSU awards per share					$ 22.06	$ 17.56	$ 17.40
Future compensation expense					$ 1.8
Non Employee Trustee Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate compensation expense					$ 0.6	$ 0.8	$ 0.8
Weighted average period of unrecognized compensation expense					73 days
Fair value of shares granted to non-employee trustees					$ 1.1	$ 0.9	$ 0.5
Non Employee Trustee Awards [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate compensation expense		$ 0.2