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Related Party Transactions (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Payments to Aviation Charter [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | $ 211,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionAxis = mth_PaymentstoAviationCharterMember | $ 359,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionAxis = mth_PaymentstoAviationCharterMember | $ 330,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / us-gaap_RelatedPartyTransactionAxis = mth_PaymentstoAviationCharterMember
Alliance Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Interest income on cash deposits placed with affiliated entity | 430,000 us-gaap_InterestIncomeRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mth_AllianceBankMember | 654,000 us-gaap_InterestIncomeRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mth_AllianceBankMember | 687,000 us-gaap_InterestIncomeRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mth_AllianceBankMember
Alliance Bank [Member] | Affiliate Entity, a Custodian of CDARS [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Cash deposits with related party | 9,995 mth_CashDepositsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = mth_AffiliateEntityCustodianOfCdarsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mth_AllianceBankMember | 89,500,000 mth_CashDepositsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = mth_AffiliateEntityCustodianOfCdarsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mth_AllianceBankMember |
Alliance Bank [Member] | Affiliate Entity, a Custodian of ICS [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Cash deposits with related party | $ 907 mth_CashDepositsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = mth_AffiliateEntityCustodianOfIcsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mth_AllianceBankMember | $ 157,500,000 mth_CashDepositsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = mth_AffiliateEntityCustodianOfIcsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = mth_AllianceBankMember |

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- Definition Cash deposits held in bank accounts with a related party. + References No definition available. + Details
Name: | mth_CashDepositsWithRelatedParty
Namespace Prefix: | mth_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of interest income earned from interest-bearing assets owed to the entity by related party. + References No definition available. + Details
Name: | us-gaap_InterestIncomeRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=mth_PaymentstoAviationCharterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=mth_AllianceBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |