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Fair Value Disclosures (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Apr. 30, 2012
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4.50% senior notes due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | $ 175,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandEighteenMemberDomain |  |
4.50% senior notes due 2018 [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | 175,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandEighteenMemberDomain | 175,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandEighteenMemberDomain |
Fair value of fixed-rate debt |  |  |
Estimated Fair Value | 175,000,000 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandEighteenMemberDomain | 174,125,000 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandEighteenMemberDomain |
7.15% senior notes due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | 200,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandTwentyMember |  |
7.15% senior notes due 2020 [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | 300,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandTwentyMember | 300,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandTwentyMember |
Fair value of fixed-rate debt |  |  |
Estimated Fair Value | 322,500,000 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandTwentyMember | 325,500,000 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandTwentyMember |
7.00% senior notes due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal |  |  | 300,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandTwentyTwoMember
7.00% senior notes due 2022 [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | 300,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandTwentyTwoMember | 300,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandTwentyTwoMember |
Fair value of fixed-rate debt |  |  |
Estimated Fair Value | 318,000,000 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandTwentyTwoMember | 318,750,000 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_SeniorNotesDueTwoThousandTwentyTwoMember |
1.875% convertible senior notes due 2032 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | 126,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = mth_ConvertibleSeniorNotesDueTwoThousandThirtyTwoMemberMember |  |
1.875% convertible senior notes due 2032 [Member] | Level 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Principal | 126,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_ConvertibleSeniorNotesDueTwoThousandThirtyTwoMemberMember | 126,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_ConvertibleSeniorNotesDueTwoThousandThirtyTwoMemberMember |
Fair value of fixed-rate debt |  |  |
Estimated Fair Value | $ 124,444,000 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_ConvertibleSeniorNotesDueTwoThousandThirtyTwoMemberMember | $ 142,154,000 us-gaap_DebtInstrumentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_LongtermDebtTypeAxis = mth_ConvertibleSeniorNotesDueTwoThousandThirtyTwoMemberMember |

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