Partners' Capital (Narrative) (Details) (USD $)	0 Months Ended	1 Months Ended					12 Months Ended							1 Months Ended	12 Months Ended		12 Months Ended		1 Months Ended	0 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended							0 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended	0 Months Ended		12 Months Ended		0 Months Ended		15 Months Ended	0 Months Ended
	Dec. 31, 2010	Feb. 28, 2013	Jan. 31, 2013	Dec. 31, 2012		Apr. 30, 2012	Dec. 31, 2012 item		Dec. 31, 2011		Feb. 08, 2013	Dec. 30, 2010	Dec. 31, 2012 Class C Convertible Preferred [Member]	Feb. 28, 2013 Class B Units [Member]	Dec. 31, 2011 QRE GP [Member]	Dec. 31, 2012 QRE GP [Member]	Dec. 31, 2012 Fund [Member]	Dec. 31, 2011 Fund [Member]	Oct. 31, 2011 Fund [Member] Class C Convertible Preferred [Member]	Dec. 30, 2010 Fund [Member] QRE GP [Member]	Dec. 31, 2012 Fund [Member] QRE GP [Member]	Dec. 31, 2011 Fund [Member] QRE GP [Member]	Dec. 31, 2012 Limited Partners-Public Common [Member]	Apr. 30, 2012 Limited Partners-Public Common [Member]	Jan. 31, 2011 Limited Partners-Public Common [Member]	Dec. 31, 2010 Limited Partners-Public Common [Member]	Dec. 31, 2010 Limited Partners-Public Common [Member] Fund [Member]	Apr. 30, 2012 Limited Partners-Affiliated - Common [Member] Fund [Member]	Dec. 31, 2010 Limited Partners-Affiliated - Subordinated [Member] Fund [Member]	Dec. 31, 2010 General Partner [Member]	Dec. 31, 2012 General Partner [Member]	Apr. 30, 2012 General Partner [Member] QRE GP [Member]	Dec. 31, 2012 General Partner [Member] QRE GP [Member]	Oct. 03, 2016 Forecast [Member] item	Oct. 03, 2014 Forecast [Member] item	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Minimum [Member] QRE GP And Affiliates [Member]	Oct. 03, 2016 Minimum [Member] Forecast [Member]	Oct. 03, 2014 Minimum [Member] Forecast [Member]	Dec. 31, 2014 Minimum [Member] Forecast [Member]	Oct. 03, 2014 Maximum [Member] Forecast [Member]	Dec. 31, 2012 Annual [Member] Limited Partners-Affiliated - Subordinated [Member]	Dec. 31, 2011 Quarterly [Member] Class C Convertible Preferred [Member]	Dec. 31, 2012 Quarterly [Member] Limited Partners-Affiliated - Subordinated [Member]	Jan. 31, 2015 Quarterly [Member] Forecast [Member] Class C Convertible Preferred [Member]
Partners' Capital Activity [Line Items]
Percentage of management fee converted to Class B units			80.00%
Partners' capital account, units, sold in public offering																							12,000,000	6,202,263		15,000,000		11,297,737
Partners' capital account, price per unit, sold in public offering																							$ 16.24	$ 19.1800	$ 20.00
Costs associated with the Offering																							$ 200,000	$ 500,000
Underwriter's discount																							9,000,000	6,800,000
Number of days for underwriters' allotment option																							30 days	30 days
Underwriter's exercise of over-allotment																							1,800,000	2,625,000	2,250,000
Proceeds from unit offering, net of offering costs	279,750,000						376,938,000		41,963,000														214,900,000	162,000,000
Ownership percentage															0.10%		31.70%	67.00%		0.10%	100.00%	100.00%											0.10%
General Partners' account, units sold to QRE GP																														35,729	15,307	6,018	9,289
General Partners' account, price per unit, sold to QRE GP																																$ 19.18	$ 16.91
Proceeds from the issuance of General Partnership units				200,000		100,000
Units issued to Fund																			16,666,667								11,297,737		7,145,866
Units issued to Predecessor																			16,666,667								11,297,737		7,145,866
Issue of units in lieu of management fee														6,133,558
Management fee paid		700,000		700,000
General partner, outstanding (in units)				51,036			51,036		35,729			35,729				51,036
Cash distribution per unit											$ 0.4875																															$ 1.65	$ 0.21	$ 0.4125	$ 0.475
Distributions payable				$ 3,500,000	[1]		$ 3,500,000	[1]	$ 20,545,000	[1]			$ 3,500,000,000
Conversion ratio preferred units to common units							1																											1	1
Volume weighted average price per common unit to convert from preferred units to common units																																						$ 27.30	$ 27.30	$ 27.30	$ 30.03
Conversion date of Preferred Units to common units																																				Oct. 03, 2013
Number of consecutive trading days for conversion of preferred units to common units																																						30 days	30	30 days
Percentage of underwriters discount on common unit																																									5.00%
Threshold ownership percentage of outstanding common units to purchase remaining outstanding common units																																					80.00%

[1] For the year ended December 31, 2012, balance includes preferred distributions payable to affiliates of $3.5 million.