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Noncontrolling Interest - Holders of Convertible Limited Partnership Units in Operating Partnership - Additional Information (Detail) - Noncontrolling Interest - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Noncontrolling Interest [Line Items]
Percentage of ownership interest of noncontrolling interest	25.80%		25.80%
Limited partnership units	7,200		7,200
Limited partnership units, conversion ratio	100.00%		100.00%
Outstanding stock percent that should be acquired for rights to be exercised	39.90%		39.90%
Limited partnership units convertible in to shares of common stock, eligible for conversion	1,151		1,151
Fully converted partnership units and diluted weighted average shares outstanding	28,400	27,900	28,400	27,800

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- Definition

Limited Partners' Capital Account, Convertible Units, Conversion Ratio

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- Definition

Limited Partners' Capital Account, Convertible Units, Eligible for Conversion

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- Definition

Minimum Outstanding Stock Percentage That Should be Acquired for Rights Issued to Become Exercisable

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- Definition

Partners' Capital Account, Units, Converted and Weighted Average Shares Outstanding, Diluted

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- Definition

The number of limited partner units outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section S99



-Paragraph 5



-Subparagraph (SAB TOPIC 4.F)



-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 272



-SubTopic 10



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Staff Accounting Bulletin (SAB)



-Number Topic 4



-Section F

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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