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Commitments and Contingencies (Details) (USD $)
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0 Months Ended |
1 Months Ended |
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Dec. 09, 2010
lender
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Mar. 31, 2012
claim
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Mar. 31, 2015
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Dec. 31, 2014
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Mar. 31, 2014
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Feb. 14, 2014
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Dec. 31, 2013
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Jul. 17, 2013
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Jul. 08, 2013
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Jun. 17, 2013
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Jun. 06, 2011
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Dec. 31, 2008
action
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Oct. 26, 2011
JointVenture
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| Loss Contingencies [Line Items] |
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| Reserved for litigation and asserted claims |
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$ 15,109,000us-gaap_LitigationReserve
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$ 16,499,000us-gaap_LitigationReserve
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| Warranty reserve |
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21,839,000us-gaap_StandardProductWarrantyAccrual
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22,080,000us-gaap_StandardProductWarrantyAccrual
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21,482,000us-gaap_StandardProductWarrantyAccrual
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21,971,000us-gaap_StandardProductWarrantyAccrual
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| Loss Contingency, Pending Claims, Number |
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2us-gaap_LossContingencyPendingClaimsNumber
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| Number of lenders filing petition for involuntary bankruptcy |
3mth_NumberOfLendersFilingPetitionForInvoluntaryBankruptcy
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| Initial Litigation Judgment Amount |
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15,053,857mth_InitialLitigationJudgmentAmount
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| Litigation Judgment Amount With Interest |
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15,753,344mth_LitigationJudgmentAmountWithInterest
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| Litigation Judgment Interest |
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699,487mth_LitigationJudgmentInterest
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| Supersedeas Bond |
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16,930,477mth_SupersedeasBond
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16,050,604mth_SupersedeasBond
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| Incremental Attorney Fees to Supersedeas Bond |
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877,241mth_IncrementalAttorneyFeestoSupersedeasBond
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| Amount requested in demand for arbitration related to alleged breaches |
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13,500,000us-gaap_LossContingencyDamagesSoughtValue
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| Additional amount requested in demand for arbitration related to pro rata future infrastructure improvement costs |
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9,800,000mth_FutureInfrastructureImprovementCosts
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| South Edge Guarantee [Member] |
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| Loss Contingencies [Line Items] |
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| Loss Contingency, Pending Claims, Number |
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2us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_GuaranteeObligationsByNatureAxis
= mth_SouthEdgeGuaranteeMember
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| Equity Method Investment, Ownership Percentage |
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3.53%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_GuaranteeObligationsByNatureAxis
= mth_SouthEdgeGuaranteeMember
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| Springing Repayment Guarantee Original Demand Letter |
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$ 13,200,000mth_SpringingRepaymentGuaranteeOriginalDemandLetter
/ us-gaap_GuaranteeObligationsByNatureAxis
= mth_SouthEdgeGuaranteeMember
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| South Edge [Member] |
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| Loss Contingencies [Line Items] |
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| Number of co-ventures in joint venture |
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4mth_NumberOfCoVenturesInJointVenture
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= mth_SouthEdgeMember
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