Earnings Per Share/Unit - Calculation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 903,819	$ 656,940	$ 432,272
Non-controlling interests’ share in earnings	(1,222)	(919)	(822)
Participating securities’ share in earnings	(1,602)	(2,161)	(2,105)
Net income, less participating securities’ share in earnings	$ 900,995	$ 653,860	$ 429,345
Basic weighted-average common shares	598,634	588,817	529,239
Dilutive potential common shares	203	1,322	1,222
Diluted weighted-average common shares	598,837	590,139	530,461
MPT Operating Partnership, L.P. [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 903,819	$ 656,940	$ 432,272
Non-controlling interests’ share in earnings	(1,222)	(919)	(822)
Participating securities’ share in earnings	(1,602)	(2,161)	(2,105)
Net income, less participating securities’ share in earnings	$ 900,995	$ 653,860	$ 429,345
Basic weighted-average common shares	598,634	588,817	529,239
Dilutive potential common shares	203	1,322	1,222
Diluted weighted-average common shares	598,837	590,139	530,461