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SHAREHOLDERS' EQUITY (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 04, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2004 | Aug. 28, 2006 | May 19, 1998 | Mar. 10, 2015
Preferred Stock [Abstract] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  | 99,000,000 us-gaap_CommonStockSharesAuthorized | 99,000,000 us-gaap_CommonStockSharesAuthorized |  |  | 100,000,000 us-gaap_CommonStockSharesAuthorized |
Preferred stock, shares authorized (in shares) |  | 1,000,000 us-gaap_PreferredStockSharesAuthorized | 1,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01 us-gaap_PreferredStockParOrStatedValuePerShare |  |  |  |
Preferred stock, shares issued (in shares) |  | 0 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued |  |  |  |
Preferred stock, shares outstanding (in shares) |  | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares issued for services rendered | 6,000 us-gaap_StockIssuedDuringPeriodSharesIssuedForServices |  |  |  |  |  |
Additional shares issued due to exercise of stock options |  | 16,164 mtex_AdditionalSharesIssuedDueToExerciseOfStockOptions |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning balance |  | $ (743,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |  |  |
Current-period change before reclassifications |  | 653,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  | (30,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |  |  |  |  |
Income tax provision |  | 11,000 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | 39,000 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax |  |  |  |
Ending balance |  | (109,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (743,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |  |
Accumulated Translation Adjustment [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning balance |  | (1,110,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |  |  |
Current-period change before reclassifications |  | 653,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  | 0 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |  |  |
Income tax provision |  | 0 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |  |  |
Ending balance |  | (457,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |  |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Beginning balance |  | 367,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  |
Current-period change before reclassifications |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  | (30,000)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  |
Income tax provision |  | 11,000 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  |
Ending balance |  | 348,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |  |  |  |  |
June 2004 Plan [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, repurchase authorization |  | the lesser of (i) 131,756 shares of its common stock and (ii) $1.3 million of its shares |  |  |  |  |
Number of common shares authorized to be repurchased (in shares) |  |  |  | 131,756 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = mtex_June2004PlanMember |  |  |
Stock repurchase program, authorized amount |  |  |  | 1,300,000 us-gaap_StockRepurchaseProgramAuthorizedAmount / us-gaap_ShareRepurchaseProgramAxis = mtex_June2004PlanMember |  |  |
June 2004 Plan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, remaining number of shares authorized to be repurchased (in shares) |  |  |  |  |  |  | 19,084 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = mtex_June2004PlanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Stock repurchased since inception shares (in shares) |  |  |  |  |  |  | 112,672 mtex_StockRepurchasedSinceInceptionShares / us-gaap_ShareRepurchaseProgramAxis = mtex_June2004PlanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
August 2006 Plan [Member] |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, repurchase authorization |  | up to $20 million of its outstanding shares |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 20,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount / us-gaap_ShareRepurchaseProgramAxis = mtex_August2006PlanMember |  |
Common stock repurchased (in shares) |  | 0 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = mtex_August2006PlanMember |  |  |  |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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