Earnings Per Share/Unit - Calculation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 222,020	$ 190,064	$ 631,947	$ 171,395	$ 114,821	$ 163,880	$ 1,044,031	$ 450,096
Non-controlling interests’ share in net income	(227)			(258)			(960)	(611)
Participating securities’ share in earnings	(288)			(328)			(1,035)	(1,088)
Net income, less participating securities’ share in earnings	$ 221,505			$ 170,809			$ 1,042,036	$ 448,397
Basic weighted-average common shares	598,980			595,119			598,828	586,291
Dilutive potential common shares	359			2,201			271	1,680
Diluted weighted-average common shares	599,339			597,320			599,099	587,971
MPT Operating Partnership, L.P. [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 222,020	$ 190,064	$ 631,947	$ 171,395	$ 114,821	$ 163,880	$ 1,044,031	$ 450,096
Non-controlling interests’ share in net income	(227)			(258)			(960)	(611)
Participating securities’ share in earnings	(288)			(328)			(1,035)	(1,088)
Net income, less participating securities’ share in earnings	$ 221,505			$ 170,809			$ 1,042,036	$ 448,397
Basic weighted-average common shares	598,980			595,119			598,828	586,291
Dilutive potential common shares	359			2,201			271	1,680
Diluted weighted-average common shares	599,339			597,320			599,099	587,971