Earnings Per Share/Unit - Calculation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 631,947	$ 163,880
Non-controlling interests’ share in net income	(266)	(97)
Participating securities’ share in earnings	(402)	(370)
Net income, less participating securities’ share in earnings	$ 631,279	$ 163,413
Basic weighted-average common shares	598,676	576,240
Dilutive potential common shares	256	1,301
Diluted weighted-average common shares	598,932	577,541
MPT Operating Partnership, L.P. [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 631,947	$ 163,880
Non-controlling interests’ share in net income	(266)	(97)
Participating securities’ share in earnings	(402)	(370)
Net income, less participating securities’ share in earnings	$ 631,279	$ 163,413
Basic weighted-average common shares	598,676	576,240
Dilutive potential common shares	256	1,301
Diluted weighted-average common shares	598,932	577,541