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Earnings Per Share - Additional Information (Detail) (USD $)			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Senior convertible notes due 2040 [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Senior convertible notes convertible to common shares price			$ 15.08
Conversion price as a percentage of common share price			125.00%
OP Units, outstanding	1,441,890	398,701

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- Definition

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

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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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The number of each class of partnership units outstanding at the balance sheet date. Units represent shares of ownership of the general, limited, and preferred partners.

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