Quarterly report pursuant to Section 13 or 15(d)

Investments in Unconsolidated Entities (Details Textual)

v2.4.1.9
Investments in Unconsolidated Entities (Details Textual) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Investments in unconsolidated entities $ 10,271,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 10,780,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
South Edge Guarantee [Member]    
Schedule of Equity Method Investments [Line Items]    
Guarantor Obligations, Maximum Exposure, Undiscounted 13,200,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= mth_SouthEdgeGuaranteeMember
 
Equity method land ventures [Member]    
Schedule of Equity Method Investments [Line Items]    
Number of joint ventures 2mth_NumberOfActiveJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mth_EquityMethodLandVenturesMember
 
Mortgage joint ventures    
Schedule of Equity Method Investments [Line Items]    
Number of joint ventures 1mth_NumberOfActiveJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mth_MortgageJointVenturesMember
 
Investments in unconsolidated entities $ 1,500,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mth_MortgageJointVenturesMember
$ 2,000,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mth_MortgageJointVenturesMember