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v2.4.0.6

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