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Common Stock/Partners' Capital - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Jan. 11, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Class Of Stock [Line Items]                    
Common stock, shares issued   596,145           596,145   541,419
Proceeds from sale of common shares / units, net of offering costs               $ 1,041,054 $ 294,374  
MPT Operating Partnership, L.P. [Member]                    
Class Of Stock [Line Items]                    
Number of units sold               52,600 15,400  
MPT Operating Partnership, L.P. [Member] | Medical Properties Trust, LLC. [Member]                    
Class Of Stock [Line Items]                    
Percentage of ownership of general partner               100.00%    
MPT Operating Partnership, L.P. [Member] | MPT TRS, Inc [Member]                    
Class Of Stock [Line Items]                    
Percentage of ownership of general partner               100.00%    
MPT Operating Partnership, L.P. [Member] | Operating Partnership [Member]                    
Class Of Stock [Line Items]                    
Percentage of ownership limited partner               100.00%    
Public Offering [Member]                    
Class Of Stock [Line Items]                    
Common stock, shares issued 36,800                  
Proceeds from sale of common shares / units, net of offering costs $ 711,000                  
At-the-Market Equity Offering Program [Member]                    
Class Of Stock [Line Items]                    
Proceeds from sale of common shares / units, net of offering costs               $ 330,000 $ 294,000  
Common Units [Member]                    
Class Of Stock [Line Items]                    
Number of share sold   6,963 5,679 39,949 6,745 6,017 2,601      
Common Units [Member] | At-the-Market Equity Offering Program [Member]                    
Class Of Stock [Line Items]                    
Number of share sold               15,800 15,400