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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
	Sep. 30, 2014	Sep. 15, 2014	Dec. 31, 2013
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Quarterly dividend paid per Common Share	$ 0
Liquidating distribution per preferred share			$ 25
Liquidation preference plus accrued and unpaid dividends		$ 25.00
Series D Preferred Shares of Beneficial Interest [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Liquidating distribution per preferred share		$ 25.4815

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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