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Consolidated Statements of Cash Flow (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Join venture impairments	$ 0	$ 0	$ 400,000

X

- Definition

Joint Venture Impairments

+ References

No definition available.

+ Details

Name:	mth_JointVentureImpairments
Namespace Prefix:	mth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration