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Operating and Reporting Segments (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Segment Reporting Information [Line Items] |  |
Deposits on real estate under option or contract | $ 94,989 us-gaap_DepositAssets | $ 51,595 us-gaap_DepositAssets
Real estate | 1,877,682 us-gaap_InventoryRealEstate | 1,405,299 us-gaap_InventoryRealEstate
Investments in unconsolidated entities | 10,780 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 11,638 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Other assets | 332,687 us-gaap_OtherAssets | 534,829 us-gaap_OtherAssets
Assets | 2,316,138 us-gaap_Assets | 2,003,361 us-gaap_Assets
Financial Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Deposits on real estate under option or contract | 0 us-gaap_DepositAssets / us-gaap_StatementBusinessSegmentsAxis = mth_FinancialServicesMember | 0 us-gaap_DepositAssets / us-gaap_StatementBusinessSegmentsAxis = mth_FinancialServicesMember
Real estate | 0 us-gaap_InventoryRealEstate / us-gaap_StatementBusinessSegmentsAxis = mth_FinancialServicesMember | 0 us-gaap_InventoryRealEstate / us-gaap_StatementBusinessSegmentsAxis = mth_FinancialServicesMember
Investments in unconsolidated entities | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = mth_FinancialServicesMember | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = mth_FinancialServicesMember
Other assets | 958 us-gaap_OtherAssets / us-gaap_StatementBusinessSegmentsAxis = mth_FinancialServicesMember | 497 us-gaap_OtherAssets / us-gaap_StatementBusinessSegmentsAxis = mth_FinancialServicesMember
Assets | 958 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mth_FinancialServicesMember | 497 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mth_FinancialServicesMember
Corporate, Non-Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Deposits on real estate under option or contract | 0 us-gaap_DepositAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_DepositAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Real estate | 0 us-gaap_InventoryRealEstate / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 0 us-gaap_InventoryRealEstate / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Investments in unconsolidated entities | 2,015 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 2,443 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Other assets | 132,884 us-gaap_OtherAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 310,657 us-gaap_OtherAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Assets | 134,899 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember | 313,100 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
West [Member] |  |
Segment Reporting Information [Line Items] |  |
Deposits on real estate under option or contract | 34,622 us-gaap_DepositAssets / us-gaap_StatementGeographicalAxis = mth_WestMember | 26,415 us-gaap_DepositAssets / us-gaap_StatementGeographicalAxis = mth_WestMember
Real estate | 943,600 us-gaap_InventoryRealEstate / us-gaap_StatementGeographicalAxis = mth_WestMember | 800,288 us-gaap_InventoryRealEstate / us-gaap_StatementGeographicalAxis = mth_WestMember
Investments in unconsolidated entities | 204 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementGeographicalAxis = mth_WestMember | 204 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementGeographicalAxis = mth_WestMember
Other assets | 48,120 us-gaap_OtherAssets / us-gaap_StatementGeographicalAxis = mth_WestMember | 26,900 us-gaap_OtherAssets / us-gaap_StatementGeographicalAxis = mth_WestMember
Assets | 1,026,546 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mth_WestMember | 853,807 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mth_WestMember
Central [Member] |  |
Segment Reporting Information [Line Items] |  |
Deposits on real estate under option or contract | 31,317 us-gaap_DepositAssets / us-gaap_StatementGeographicalAxis = mth_CentralMember | 12,198 us-gaap_DepositAssets / us-gaap_StatementGeographicalAxis = mth_CentralMember
Real estate | 446,208 us-gaap_InventoryRealEstate / us-gaap_StatementGeographicalAxis = mth_CentralMember | 369,464 us-gaap_InventoryRealEstate / us-gaap_StatementGeographicalAxis = mth_CentralMember
Investments in unconsolidated entities | 8,561 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementGeographicalAxis = mth_CentralMember | 8,941 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementGeographicalAxis = mth_CentralMember
Other assets | 80,689 us-gaap_OtherAssets / us-gaap_StatementGeographicalAxis = mth_CentralMember | 165,403 us-gaap_OtherAssets / us-gaap_StatementGeographicalAxis = mth_CentralMember
Assets | 566,775 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mth_CentralMember | 556,006 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mth_CentralMember
East [Member] |  |
Segment Reporting Information [Line Items] |  |
Deposits on real estate under option or contract | 29,050 us-gaap_DepositAssets / us-gaap_StatementGeographicalAxis = mth_EastMember | 12,982 us-gaap_DepositAssets / us-gaap_StatementGeographicalAxis = mth_EastMember
Real estate | 487,874 us-gaap_InventoryRealEstate / us-gaap_StatementGeographicalAxis = mth_EastMember | 235,547 us-gaap_InventoryRealEstate / us-gaap_StatementGeographicalAxis = mth_EastMember
Investments in unconsolidated entities | 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementGeographicalAxis = mth_EastMember | 50 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementGeographicalAxis = mth_EastMember
Other assets | 70,036 us-gaap_OtherAssets / us-gaap_StatementGeographicalAxis = mth_EastMember | 31,372 us-gaap_OtherAssets / us-gaap_StatementGeographicalAxis = mth_EastMember
Assets | $ 586,960 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mth_EastMember | $ 279,951 us-gaap_Assets / us-gaap_StatementGeographicalAxis = mth_EastMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Total of (1) improvements, (2) held-for-sale, (3) land and land under development, (4) construction-in-process, (5) mortgage loans held-in-inventory, and (6) other real estate investments which are considered inventory due to being held for sale or disposition. + References No definition available. + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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