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LOANS PAYABLE AND OTHER BORROWINGS - Schedule of Loans Payable and Other Borrowings (Descriptors) (Details) - Line of credit [Member] - Revolving credit facility [Member] | 12 Months Ended
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Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items] |
Unsecured revolving credit facility maturing July 2022 | $ 780,000,000
London Interbank Offered Rate (LIBOR) [Member] |
Line of Credit Facility [Line Items] |
Base rate | 2.52%
Basis spread on variable rate | 1.75%
Prime Rate [Member] |
Line of Credit Facility [Line Items] |
Base rate | 5.50%
Basis spread on variable rate | 0.75%

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- Definition Debt Instrument, Base Rate + References No definition available. + Details
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Namespace Prefix: | mth_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |