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Earnings Per Share - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2015 Days $ / shares shares	Jun. 30, 2014 shares
Earnings Per Share Disclosure [Line Items]
OP Units, outstanding | shares	1,441,890	1,441,890
Senior Convertible Notes due 2040 [Member]
Earnings Per Share Disclosure [Line Items]
Average trading price exceeds conversion price percentage	125.00%
Senior convertible notes convertible to common shares price | $ / shares	$ 14.59
Trading days, minimum	20
Trading days, maximum	30 days

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- Definition

Earnings per share disclosure.

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 470



-SubTopic 20



-Section 50



-Paragraph 5



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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- Definition

The number of units of other ownership interests outstanding in a limited partnership or master limited partnership. Does not include limited or general partners' ownership interests.

+ 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



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