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Common Stock/Partners' Capital - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 11, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Class Of Stock [Line Items]              
Common stock, shares issued         598,983,000   596,748,000
Proceeds from sale of common shares / units, net of offering costs           $ 1,041,054  
MPT Operating Partnership, L.P. [Member]              
Class Of Stock [Line Items]              
Number of units sold           52,600,000  
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 36,800,000            
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  
Common Units [Member]              
Class Of Stock [Line Items]              
Number of share sold   6,963,000 5,679,000 39,949,000      
Common Units [Member] | At-the-Market Equity Offering Program [Member]              
Class Of Stock [Line Items]              
Number of share sold           15,800,000