Supplemental Disclosures of Cash Flow Information (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Realty Income, L.P.	Jun. 30, 2013 ARCT	Jan. 22, 2013 ARCT
Acquisition of American Realty Capital Trust, Inc.
Real estate investments and related intangible assets				$ 3,200,000,000
Other assets				21,000,000	42,334,000
Lines of credit payable				317,200,000	317,207,000
Term loan				235,000,000	235,000,000
Other liabilities				24,700,000	24,669,000
Mortgage notes payable			32,400,000	539,000,000	538,960,000
Number of units issued			534,546
Cash			1,000,000		56,216,000
Acquired lease intangible liabilities				76,000,000	76,043,000
Noncontrolling interests				14,000,000
Real estate acquired			55,900,000	3,200,000,000
Cash paid for interest	78,600,000	55,700,000
Interest capitalized to properties under development	369,000	277,000
Cash paid for income taxes	1,500,000	818,000
Non-cash investing and financing activities
Share-based compensation expense	7,498,000	5,550,000
Mortgages assumed	113,700,000
Net premiums recorded on mortgages assumed	5,700,000
Real estate acquired via exchange of properties	7,400,000
Increase in buildings and improvements and accounts payable	$ 836,000	$ 1,900,000