Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2018	Dec. 31, 2017
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	364,858,000	364,424,000
Common stock, shares outstanding	364,858,000	364,424,000
MPT Operating Partnership, L.P. [Member] | Common Units [Member]
Limited Partners, units issued	361,210,000	360,780,000
Limited Partners, units outstanding	361,210,000	360,780,000
General Partner [Member] | MPT Operating Partnership, L.P. [Member]
General partner, units issued	3,648,000	3,644,000
General partner, units outstanding	3,648,000	3,644,000
LTIP Units [Member] | MPT Operating Partnership, L.P. [Member]
LTIP Units, shares issued	232,000	292,000
LTIP Units, shares outstanding	232,000	292,000