Partners' Capital (Narrative) (Details) (USD $)	0 Months Ended			6 Months Ended	9 Months Ended				0 Months Ended	9 Months Ended	0 Months Ended		9 Months Ended	0 Months Ended		9 Months Ended
	Apr. 25, 2012	Apr. 17, 2012	Jan. 03, 2011	Oct. 15, 2012	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 QRE GP [Member]	Apr. 17, 2012 Fund [Member]	Sep. 30, 2012 Fund [Member]	Apr. 17, 2012 Limited Partners-Public Common [Member]	Dec. 22, 2010 Limited Partners-Public Common [Member]	Sep. 30, 2012 Limited Partners-Public Common [Member]	Apr. 17, 2012 Limited Partners-Public Common [Member] Fund [Member]	Apr. 17, 2012 Over-Allotment [Member]	Sep. 30, 2012 General Partner [Member]	Sep. 30, 2012 General Partner [Member] QRE GP [Member]
Partners' Capital Activity [Line Items]
Partners' capital account, units, sold in public offering			2,250,000								6,202,263	15,000,000		11,297,737	2,625,000
Partners' capital account, price per unit, sold in public offering		$ 19.18							19.18
Costs associated with the Offering		$ 500,000
Underwriter's discount		6,800,000
Number of days for underwriters' allotment option					30 days
Proceeds from unit offering, net of offering costs				162,000,000	161,958,000	41,963,000
Ownership percentage										38.80%			61.10%				0.10%
General Partners' account, units sold to QRE GP	6,018															6,018
General Partners' account, price per unit, sold to QRE GP	$ 19.18
General partner, outstanding (in units)					41,747		35,729	41,747
Cash distribution per unit					$ 0.4875
Distributions payable					$ 25,628,000		$ 20,545,000