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Operating and Reporting Segments Operating and Reporting Segments (Details 2) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Land closing revenue | $ 27,252,000 us-gaap_LandSales | $ 31,270,000 us-gaap_LandSales | $ 9,314,000 us-gaap_LandSales
West [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Land closing revenue | 11,155,000 us-gaap_LandSales / us-gaap_StatementGeographicalAxis = mth_WestMember | 11,616,000 us-gaap_LandSales / us-gaap_StatementGeographicalAxis = mth_WestMember | 6,488,000 us-gaap_LandSales / us-gaap_StatementGeographicalAxis = mth_WestMember
Central [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Land closing revenue | 8,603,000 us-gaap_LandSales / us-gaap_StatementGeographicalAxis = mth_CentralMember | 16,184,000 us-gaap_LandSales / us-gaap_StatementGeographicalAxis = mth_CentralMember | 2,036,000 us-gaap_LandSales / us-gaap_StatementGeographicalAxis = mth_CentralMember
East [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Land closing revenue | $ 7,494,000 us-gaap_LandSales / us-gaap_StatementGeographicalAxis = mth_EastMember | $ 3,470,000 us-gaap_LandSales / us-gaap_StatementGeographicalAxis = mth_EastMember | $ 790,000 us-gaap_LandSales / us-gaap_StatementGeographicalAxis = mth_EastMember

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- Definition Revenue from the sale of land in the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_LandSales
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementGeographicalAxis=mth_CentralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=mth_EastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=mth_WestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |