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Summary of Significant Accounting Policies - Carrying Value and Classification of Related Assets and Maximum Exposure to Loss (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Mortgage and other loans [Member]  
Variable Interest Entity [Line Items]  
Carrying Amount $ 207,617us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= mpw_MortgageAndOtherLoansMember
Loans, net [Member]  
Variable Interest Entity [Line Items]  
Maximum Loss Exposure 257,208us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_LoansMember
Other assets [Member]  
Variable Interest Entity [Line Items]  
Carrying Amount 5,490us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
Equity investments [Member]  
Variable Interest Entity [Line Items]  
Maximum Loss Exposure $ 53,542us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquityMethodInvestmentsMember