Earnings Per Share/Unit - Calculation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 33,030	$ 631,947
Non-controlling interests' share in earnings	(236)	(266)
Participating securities’ share in earnings	(515)	(402)
Net income, less participating securities’ share in earnings	$ 32,279	$ 631,279
Basic weighted-average common shares	598,302	598,676
Dilutive potential common shares	8	256
Diluted weighted-average common shares	598,310	598,932
MPT Operating Partnership, L.P. [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 33,030	$ 631,947
Non-controlling interests' share in earnings	(236)	(266)
Participating securities’ share in earnings	(515)	(402)
Net income, less participating securities’ share in earnings	$ 32,279	$ 631,279
Basic weighted-average common shares	598,302	598,676
Dilutive potential common shares	8	256
Diluted weighted-average common shares	598,310	598,932