Common Stock/Partners' Capital - Additional Information (Detail) shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended
	May 08, 2020 USD ($) shares	Mar. 31, 2020 USD ($) Employee shares	Mar. 31, 2019 USD ($) shares
Class Of Stock [Line Items]
Proceeds from sale of common shares / units, net of offering costs | $		$ 61,682	$ 354,030
MPT Operating Partnership, L.P. [Member]
Class Of Stock [Line Items]
Number of units sold		2,600	20,100
MPT Operating Partnership, L.P. [Member] | Employee [Member]
Class Of Stock [Line Items]
Number of partners shared remaining ownership percentage | Employee		2
MPT Operating Partnership, L.P. [Member] | Operating Partnership [Member]
Class Of Stock [Line Items]
Percentage of ownership limited partner		99.90%
Common Units [Member]
Class Of Stock [Line Items]
Number of share sold		2,601	20,147
At-the-Market Equity Offering Program [Member]
Class Of Stock [Line Items]
Proceeds from sale of common shares / units, net of offering costs | $		$ 62,000	$ 354,000
At-the-Market Equity Offering Program [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Proceeds from sale of common shares / units, net of offering costs | $	$ 102,500
At-the-Market Equity Offering Program [Member] | Common Units [Member]
Class Of Stock [Line Items]
Number of share sold		2,600	20,100
At-the-Market Equity Offering Program [Member] | Common Units [Member] | Subsequent Event [Member]
Class Of Stock [Line Items]
Number of share sold	5,700