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Subsequent Events (Details) (USD $) | 12 Months Ended |  | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 Legendary Communities Acquisition [Member] | Jun. 30, 2014 Legendary Communities Acquisition [Member] | Jun. 30, 2014 Minimum [Member] | Jun. 30, 2014 Minimum [Member] Legendary Communities Acquisition [Member] | Jun. 30, 2014 Maximum [Member] | Jun. 30, 2014 Maximum [Member] Legendary Communities Acquisition [Member]
Purchase Price of Acquisition |  | $ 130,000,000 |  |  |  |
Base Price Per House For Sale Range |  |  | 130,000 | 120,000 | 875,000 | 550,000
Business Acquisition Number of Homes Closed | 500 |  |  |  |  |
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period | $ 156,000,000 |  |  |  |  |
Lots Acquired |  | 4,000 |  |  |  |

X
- Definition The price range as of the balance sheet date relating to the houses the Company has for sale. + References No definition available. + Details
Name: | mth_BasePricePerHouseForSaleRange
Namespace Prefix: | mth_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of homes closed by acquired entity for the last annual reporting period + References No definition available. + Details
Name: | mth_BusinessAcquisitionNumberofHomesClosed
Namespace Prefix: | mth_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lots acquired both owned and under contract + References No definition available. + Details
Name: | mth_LotsAcquired
Namespace Prefix: | mth_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Purchase Price of Acquisition - gross purchase price of acquired entity + References No definition available. + Details
Name: | mth_PurchasePriceofAcquisition
Namespace Prefix: | mth_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration