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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