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Noncontrolling Interest - Holders of Convertible Limited Partnership Units in Operating Partnership - Additional Information (Detail) - Noncontrolling Interests - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Noncontrolling Interest [Line Items]
Percentage of ownership interest of noncontrolling interest	25.80%
Limited partnership units	7,305,758
Limited partnership units, conversion ratio	100.00%
Outstanding stock percent that should be acquired for rights to be exercised	39.90%
Limited partnership units convertible in to shares of common stock, eligible for conversion	1,040,000
Fully converted partnership units and diluted weighted average shares outstanding	28,449,400	27,977,500	27,330,100

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

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

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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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