Common Stock/Partner's Capital - Additional Information (Detail) (USD $)	9 Months Ended			9 Months Ended				0 Months Ended			9 Months Ended	1 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 MPT Operating Partnership, L.P. [Member] Partner	Sep. 30, 2013 MPT Operating Partnership, L.P. [Member]	Sep. 30, 2014 Employee [Member] Employee	Sep. 30, 2014 Director [Member] Director	Mar. 11, 2014 Public Offering [Member]	Aug. 20, 2013 Public Offering [Member]	Feb. 28, 2013 Public Offering [Member]	Sep. 30, 2014 Public Offering [Member]	Jan. 31, 2014 Market Equity Offering Program [Member]	Sep. 30, 2014 Market Equity Offering Program [Member]	Sep. 30, 2014 Market Equity Offering Program [Member] IPO [Member]	Jan. 31, 2014 Market Equity Offering Program [Member] Maximum [Member]
Class of Stock [Line Items]
Common stock, shares issued	171,626,000		161,310,000					7,700,000	11,500,000	12,700,000			900,000
Net proceed from issuance of common stock	$ 128,270,000	$ 313,319,000		$ 128,270,000	$ 313,319,000			$ 100,200,000	$ 140,400,000	$ 172,900,000			$ 12,300,000
Additional shares purchased by underwriters								1,200,000	1,500,000	1,700,000
Time granted to underwriters to purchase shares											30 days
Net proceeds from additional issuance of shares								16,000,000
Number of shares can be sold out															$ 250,000,000
Sales commission percentage												1.25%
Public offering price for common stock per share														$ 13.21
Share price									$ 12.75	$ 14.25
Ownership interest in equity				99.90%
Number of units sold				9,800,000	24,200,000
Number of other partners				3
Number of partners shared remaining ownership percentage						2	1