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Related Party Transactions (Details Textual) (Alliance Bank [Member], USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Related Party Transaction [Line Items] |  |
Interest income on cash deposits placed with affiliated entity | $ 687,000 | $ 767,000
Affiliate Entity, a Custodian of CDARS [Member] |  |
Related Party Transaction [Line Items] |  |
Cash deposits with related party | 102,100,000 | 149,400,000
Affiliate Entity, a Custodian of ICS [Member] |  |
Related Party Transaction [Line Items] |  |
Cash deposits with related party | $ 84,200,000 | $ 0

X
- 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

X
- Definition Interest income from the cash deposits held in bank accounts with a related party. + References No definition available. + Details
Name: | mth_InterestIncomeRelatedParty
Namespace Prefix: | mth_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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