Common Stock/Partner's Capital - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 11, 2014	Aug. 20, 2013	Feb. 28, 2013	Jan. 31, 2014
Class of Stock [Line Items]
Common stock, issued	172,743,000	161,310,000
Net proceed from issuance of common stock	$ 138,173,000	$ 313,330,000	$ 233,048,000
Ownership interest in equity	100.00%
MPT Operating Partnership, L.P. [Member]
Class of Stock [Line Items]
Net proceed from issuance of common stock	138,173,000	313,330,000	233,048,000
Percentage of ownership of general partner	100.00%
Ownership interest in equity	99.80%
Number of other partners	3
Employee [Member]
Class of Stock [Line Items]
Number of partners shared remaining ownership percentage	2
Director [Member]
Class of Stock [Line Items]
Number of partners shared remaining ownership percentage	1
Public Offering [Member]
Class of Stock [Line Items]
Common stock, issued				7,700,000	11,500,000	12,700,000
Net proceed from issuance of common stock				100,200,000	140,400,000	172,900,000
Time granted to underwriters to purchase shares	30 days
Additional shares purchased by underwritters				1,200,000	1,500,000	1,700,000
Net proceeds from additional issuance of shares				16,000,000
Public offering price for common stock per share					$ 12.75	$ 14.25
Market Equity Offering Program [Member]
Class of Stock [Line Items]
Common stock, issued	1,700,000
Net proceed from issuance of common stock	22,600,000
Sales commission percentage							1.25%
Market Equity Offering Program [Member] | IPO [Member]
Class of Stock [Line Items]
Public offering price for common stock per share	$ 13.56
Market Equity Offering Program [Member] | Maximum [Member]
Class of Stock [Line Items]
Number of shares can be sold out							250,000,000