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PROPERTY AND EQUIPMENT (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Summary of property and equipment [Abstract]    
Property and equipment, gross $ 75,546us-gaap_PropertyPlantAndEquipmentGross $ 75,142us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (73,065)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (71,972)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 2,481mtex_PropertyPlantAndEquipmentNetExcludingConstructionInProgress 3,170mtex_PropertyPlantAndEquipmentNetExcludingConstructionInProgress
Construction in progress 1,622us-gaap_ConstructionInProgressGross 69us-gaap_ConstructionInProgressGross
Total 4,103us-gaap_PropertyPlantAndEquipmentNet 3,239us-gaap_PropertyPlantAndEquipmentNet
Office Furniture and Equipment [Member]    
Summary of property and equipment [Abstract]    
Property and equipment, gross 8,666us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
8,797us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
Computer Hardware [Member]    
Summary of property and equipment [Abstract]    
Property and equipment, gross 7,738us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mtex_ComputerHardwareMember
7,779us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mtex_ComputerHardwareMember
Computer Software [Member]    
Summary of property and equipment [Abstract]    
Property and equipment, gross 46,791us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
46,535us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Automobiles [Member]    
Summary of property and equipment [Abstract]    
Property and equipment, gross 81us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AutomobilesMember
111us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AutomobilesMember
Leasehold Improvements [Member]    
Summary of property and equipment [Abstract]    
Property and equipment, gross 12,270us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
11,920us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Construction in Process [Member]    
Summary of property and equipment [Abstract]    
Construction in progress $ 1,622us-gaap_ConstructionInProgressGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 69us-gaap_ConstructionInProgressGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember