Net Income Per Common Share (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income per common share
Weighted average shares used for the basic net income per share computation	195,768,298	132,764,877	187,805,222	132,731,984
Incremental shares from share-based compensation		166,936	114,018	113,986
Adjusted weighted average shares used for diluted net income per share computation	196,619,866	132,931,813	188,399,848	132,845,970
Unvested shares from share-based compensation that were anti-dilutive	60,259	600	59,749	17,200
Tau Operating Partnership, L.P.
Net income per common share
Weighted average common units convertible to common shares	317,022		292,636
Realty Income, L.P.
Net income per common share
Weighted average common units convertible to common shares	534,546		187,972