Related Party Transactions (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Allocated General And Andminstative Expense From QRM [Member]	Sep. 30, 2013 Allocated General And Andminstative Expense From QRM [Member]	Sep. 30, 2014 Allocated General And Andminstative Expense From QRM [Member]	Sep. 30, 2013 Allocated General And Andminstative Expense From QRM [Member]	Mar. 31, 2014 Fund [Member] QRE GP [Member]	Sep. 30, 2014 Restricted Units [Member]	Dec. 31, 2013 Restricted Units [Member]	Sep. 30, 2014 Limited Partner [Member] Fund [Member]	Sep. 30, 2014 Limited Partner [Member] QRE GP [Member]	Sep. 30, 2014 Limited Partners-Affiliated - Common [Member]	Mar. 31, 2013 Class B Units [Member]
Related Party Transaction [Line Items]
Ownership percentage										100.00%			29.20%	7.50%
Limited partners unitholders, outstanding (in units)															7,145,866
Class B convertible unitholders, outstanding (in units)			6,133,558		6,133,558
General and administrative expense allocated from the Fund						$ 7.6	$ 9.0	$ 22.6	$ 25.1
Percentage of management fee converted to Class B units																80.00%
Issue of units in lieu of management fee																6,133,558
Percentage of distribution equal or exceed minimum quarterly distributions	115.00%
Target distribution per unit			0.4744
Management incentive fee recognized		$ 0.7	$ 1.4	$ 2.0
Restricted unit awards granted											1,326,612	1,022,311