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Related Party Transactions (Details Textual) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | $ 359,000 | $ 330,000 | $ 288,000
Alliance Bank [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Interest income on cash deposits placed with affiliated entity | 654,000 | 687,000 | 767,000
Alliance Bank [Member] | Affiliate Entity, a Custodian of CDARS [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Cash deposits with related party | 89,500,000 | 102,100,000 |
Alliance Bank [Member] | Affiliate Entity, a Custodian of ICS [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Cash deposits with related party | $ 157,500,000 | $ 84,200,000 |

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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