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Variable Interest Entities and Consolidated Real Estate Not Owned (Details) (USD $)
In Thousands, unless otherwise specified
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Dec. 31, 2014
Lot
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Dec. 31, 2013
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| Summary of lots under option or contract |
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| Number of lots of Option contracts recorded on balance sheet as Real estate not owned |
70mth_NumberOfLotsUnderOptionContractsRecorded
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| Purchase Price of Option contracts recorded on balance sheet as Real estate not owned |
$ 4,999us-gaap_LandUnderPurchaseOptionsRecorded
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$ 289us-gaap_LandUnderPurchaseOptionsRecorded
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| Option/Earnest money Deposits Cash Option contracts recorded on balance sheet as Real estate not owned |
700mth_DepositAssetsOnRecordedRealEstateNotOwned
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| Number of lots not recorded |
15,014mth_NumberOfLotsUnderOptionOrContractsNotRecorded
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[1] |
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| Purchase price not recorded |
928,128us-gaap_LandUnderPurchaseOptionsNotRecorded
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[1] |
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| Option/Earnest Money Deposits Cash |
94,989us-gaap_DepositAssets
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51,595us-gaap_DepositAssets
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| Number of lots recorded and unrecorded |
15,084mth_NumberOfLotsUnderOptionOrContracts
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| Purchase Price recorded and unrecorded |
933,127mth_LandUnderPurchaseOptionsRecordedAndUnrecorded
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| Option/Earnest Money Deposits Cash recorded and unrecorded |
95,689mth_AggregateDepositAssets
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| Option Contracts Not Recorded On Balance Sheet Non Refundable Deposits Committed [Member] [Member] |
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| Summary of lots under option or contract |
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| Number of lots not recorded |
7,256mth_NumberOfLotsUnderOptionOrContractsNotRecorded
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_OptionContractsNotRecordedOnBalanceSheetNonRefundableDepositsCommittedMemberMember
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| Purchase price not recorded |
589,229us-gaap_LandUnderPurchaseOptionsNotRecorded
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_OptionContractsNotRecordedOnBalanceSheetNonRefundableDepositsCommittedMemberMember
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| Option/Earnest Money Deposits Cash |
76,197us-gaap_DepositAssets
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_OptionContractsNotRecordedOnBalanceSheetNonRefundableDepositsCommittedMemberMember
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| Purchase Contracts Not Recorded On Balance Sheet Non Refundable Deposits Committed [Member] [Member] |
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| Summary of lots under option or contract |
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| Number of lots not recorded |
2,665mth_NumberOfLotsUnderOptionOrContractsNotRecorded
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_PurchaseContractsNotRecordedOnBalanceSheetNonRefundableDepositsCommittedMemberMember
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| Purchase price not recorded |
137,095us-gaap_LandUnderPurchaseOptionsNotRecorded
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_PurchaseContractsNotRecordedOnBalanceSheetNonRefundableDepositsCommittedMemberMember
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| Option/Earnest Money Deposits Cash |
13,888us-gaap_DepositAssets
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_PurchaseContractsNotRecordedOnBalanceSheetNonRefundableDepositsCommittedMemberMember
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| Purchase Contracts not recorded on balance sheet Refundable Deposits Committed [Member] |
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| Summary of lots under option or contract |
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| Number of lots not recorded |
631mth_NumberOfLotsUnderOptionOrContractsNotRecorded
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_PurchaseContractsnotrecordedasrefundabledepositscommittedMember
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| Purchase price not recorded |
23,361us-gaap_LandUnderPurchaseOptionsNotRecorded
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_PurchaseContractsnotrecordedasrefundabledepositscommittedMember
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| Option/Earnest Money Deposits Cash |
1,349us-gaap_DepositAssets
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_PurchaseContractsnotrecordedasrefundabledepositscommittedMember
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| Total committed (on and off balance sheet) [Member] |
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| Summary of lots under option or contract |
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| Number of lots recorded and unrecorded |
10,622mth_NumberOfLotsUnderOptionOrContracts
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_CommittedMember
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| Purchase Price recorded and unrecorded |
754,684mth_LandUnderPurchaseOptionsRecordedAndUnrecorded
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_CommittedMember
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| Option/Earnest Money Deposits Cash recorded and unrecorded |
92,134mth_AggregateDepositAssets
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_CommittedMember
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| Option and Purchase contracts not recorded on balance sheet - refundable deposits, uncommitted [Member] |
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| Summary of lots under option or contract |
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| Number of lots not recorded |
4,462mth_NumberOfLotsUnderOptionOrContractsNotRecorded
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_OptionAndPurchaseContractsNotRecordedOnBalanceSheetRefundableDepositsUncommittedMember
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| Purchase price not recorded |
178,443us-gaap_LandUnderPurchaseOptionsNotRecorded
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_OptionAndPurchaseContractsNotRecordedOnBalanceSheetRefundableDepositsUncommittedMember
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| Option/Earnest Money Deposits Cash |
$ 3,555us-gaap_DepositAssets
/ mth_OptionContractsAndRealEstateNotOwnedAxis
= mth_OptionAndPurchaseContractsNotRecordedOnBalanceSheetRefundableDepositsUncommittedMember
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