Earnings Per Share/Unit - Calculation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 190,064	$ 631,947	$ 114,821	$ 163,880	$ 822,011	$ 278,701
Non-controlling interests’ share in net income	(467)		(256)		(733)	(353)
Participating securities’ share in earnings	(345)		(390)		(747)	(760)
Net income, less participating securities’ share in earnings	$ 189,252		$ 114,175		$ 820,531	$ 277,588
Basic weighted-average common shares	598,827		587,514		598,751	581,877
Dilutive potential common shares	199		1,539		228	1,420
Diluted weighted-average common shares	599,026		589,053		598,979	583,297
MPT Operating Partnership, L.P. [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 190,064	$ 631,947	$ 114,821	$ 163,880	$ 822,011	$ 278,701
Non-controlling interests’ share in net income	(467)		(256)		(733)	(353)
Participating securities’ share in earnings	(345)		(390)		(747)	(760)
Net income, less participating securities’ share in earnings	$ 189,252		$ 114,175		$ 820,531	$ 277,588
Basic weighted-average common shares	598,827		587,514		598,751	581,877
Dilutive potential common shares	199		1,539		228	1,420
Diluted weighted-average common shares	599,026		589,053		598,979	583,297