Quarterly Financial Data of the Company (unaudited) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 238,283	$ 237,651	$ 234,631	$ 214,668	$ 214,378	$ 212,164	$ 204,515	$ 216,465	$ 925,233	$ 847,522	$ 821,822
Income from continuing operations before equity in net income from unconsolidated joint ventures, (loss) gain on sale of real estate, depreciable real estate reserves, unrealized gain (loss) on embedded derivative and loss on extinguishment of debt	69,152	65,541	76,236	52,851	51,940	48,406	44,966	55,686	263,780	200,998	208,080
Equity in net income (loss) from unconsolidated joint ventures	2,265	2,296	2,153	2,127	2,177	2,075	2,626	(2,387)	8,841	4,491	(17,108)
Equity in net gain on sale of interest in unconsolidated joint venture					0	0	86	85,473	0	85,559	2,056
(Loss) gain on sale of real estate	(879)	101,069	0	0					100,190	0	0
Depreciable real estate reserves	0	(9,998)	0	0					(9,998)	0	0
Unrealized gain (loss) on embedded derivative	1,800	(1,800)	0	0
Loss on extinguishment of debt	0	0	0	(49)	(6,866)	0	(519)	0	(49)	(7,385)	(76)
Net (loss) income from discontinued operations					0	(58)	1,348	706
(Loss) gain on sale of discontinued operations					0	(250)	117,829	0	0	117,579	13,756
Net income	72,338	157,108	78,389	54,929	47,251	50,173	166,336	139,478	362,764	403,238	212,615
Net income attributable to noncontrolling interests in other partnerships	(1,946)	(293)	(6,380)	(550)	(938)	(841)	(801)	(61)	(9,169)	(2,641)	(5,200)
Preferred units dividend	(955)	(743)	0	0					(1,698)	0	0
Net income attributable to ROP common unitholder	$ 69,437	$ 156,072	$ 72,009	$ 54,379	$ 46,313	$ 49,332	$ 165,535	$ 139,417	$ 351,897	$ 400,597	$ 207,415