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Real Estate and Lending Activities - Summary of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loans [Line Items]    
Loans, Balance $ 1,039,548us-gaap_LoansReceivableNet $ 970,761us-gaap_LoansReceivableNet
Mortgage loans [Member]    
Loans [Line Items]    
Loans, Balance 437,591us-gaap_LoansReceivableNet
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_MortgageLoansOnRealEstateMember		 397,594us-gaap_LoansReceivableNet
/ us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis
= us-gaap_MortgageLoansOnRealEstateMember
Working capital and other loans [Member]    
Loans [Line Items]    
Loans, Balance 46,566us-gaap_LoansReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mpw_WorkingCapitalLoansMember		 48,031us-gaap_LoansReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mpw_WorkingCapitalLoansMember
Acquisition loans [Member]    
Loans [Line Items]    
Loans, Balance $ 555,391us-gaap_LoansReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mpw_AcquisitionLoanMember		 $ 525,136us-gaap_LoansReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mpw_AcquisitionLoanMember