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Acquisitions and Goodwill Details Textual (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 01, 2013 | Aug. 01, 2014
Goodwill, Acquired During Period | $ 22,715,000 us-gaap_GoodwillAcquiredDuringPeriod | $ 10,247,000 us-gaap_GoodwillAcquiredDuringPeriod |  |  |
Cash paid for acquisitions | 130,677,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 18,624,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |
Goodwill | 32,962,000 us-gaap_Goodwill | 10,247,000 us-gaap_Goodwill | 0 us-gaap_Goodwill |  |
East [Member] |  |  |  |  |
Goodwill | 32,962,000 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = mth_EastMember | 10,247,000 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = mth_EastMember | 0 us-gaap_Goodwill / us-gaap_StatementGeographicalAxis = mth_EastMember |  |
Nashville Acquisition [Member] |  |  |  |  |
Cash paid for acquisitions |  | 18,600,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = mth_NashvilleAcquisitionMember |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory |  |  |  | 8,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mth_NashvilleAcquisitionMember |
Nashville Acquisition [Member] | East [Member] |  |  |  |  |
Goodwill, Acquired During Period |  | 10,247,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = mth_NashvilleAcquisitionMember / us-gaap_StatementGeographicalAxis = mth_EastMember |  |  |
Legendary Communities Acquisition [Member] |  |  |  |  |
Cash paid for acquisitions | 130,677,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = mth_LegendaryCommunitiesAcquisitionMember |  |  |  |
Business Acquisition Estimated Earn Out |  |  |  |  | 10,000,000 mth_BusinessAcquisitionEstimatedEarnOut / us-gaap_BusinessAcquisitionAxis = mth_LegendaryCommunitiesAcquisitionMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory |  |  |  |  | 108,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = mth_LegendaryCommunitiesAcquisitionMember
Legendary Communities Acquisition [Member] | East [Member] |  |  |  |  |
Goodwill, Acquired During Period | $ 22,715,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = mth_LegendaryCommunitiesAcquisitionMember / us-gaap_StatementGeographicalAxis = mth_EastMember |  |  |  |

X
- Definition For compensation arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References No definition available. + Details
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Namespace Prefix: | mth_
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Balance Type: | na
Period Type: | instant

X
- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Details
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- Details
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Period Type: |

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- Details
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Period Type: |