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Equity Offering - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
	Aug. 17, 2010
Partners Capital And Distributions [Line Items]
Underwritten public offering shares, common shares	13,340,000
Underwritten public offering, price per share	$ 5.67
Net proceeds of the stock offering	$ 71.1

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

Number of new stock issued during the period.