Common Stock/Partners' Capital - Additional Information (Detail) shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020 shares	Mar. 31, 2020 shares	Jun. 30, 2019 shares	Mar. 31, 2019 shares	Jun. 30, 2020 USD ($) Employee shares	Jun. 30, 2019 USD ($) shares
Class Of Stock [Line Items]
Proceeds from sale of common shares / units, net of offering costs | $					$ 169,787	$ 399,353
MPT Operating Partnership, L.P. [Member]
Class Of Stock [Line Items]
Number of units sold					8,600	22,600
MPT Operating Partnership, L.P. [Member] | Operating Partnership [Member]
Class Of Stock [Line Items]
Percentage of ownership limited partner					99.90%
MPT Operating Partnership, L.P. [Member] | Employee [Member]
Class Of Stock [Line Items]
Number of partners shared remaining ownership percentage | Employee					2
Common Units [Member]
Class Of Stock [Line Items]
Number of share sold	6,017	2,601	2,467	20,147	8,600	22,600