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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 123us-gaap_CashAndCashEquivalentsAtCarryingValue $ 13,650us-gaap_CashAndCashEquivalentsAtCarryingValue
Receivables:    
Trade, less allowances of $475 and $450, respectively 72,263us-gaap_AccountsReceivableNetCurrent 70,869us-gaap_AccountsReceivableNetCurrent
Other 17,740us-gaap_NontradeReceivablesCurrent 4,142us-gaap_NontradeReceivablesCurrent
Prepaid expenses and other 16,860us-gaap_PrepaidExpenseAndOtherAssets 15,274us-gaap_PrepaidExpenseAndOtherAssets
Deferred income taxes 3,199us-gaap_DeferredTaxAssetsNetCurrent 3,415us-gaap_DeferredTaxAssetsNetCurrent
Total current assets 110,185us-gaap_AssetsCurrent 107,350us-gaap_AssetsCurrent
Property and equipment:    
Less accumulated depreciation (180,223)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (164,916)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property and equipment 465,749us-gaap_PropertyPlantAndEquipmentNet 415,009us-gaap_PropertyPlantAndEquipmentNet
Other assets 3,726us-gaap_OtherAssetsNoncurrent 3,443us-gaap_OtherAssetsNoncurrent
579,660us-gaap_Assets 525,802us-gaap_Assets
Current liabilities:    
Checks issued in excess of cash balances 745us-gaap_BankOverdrafts  
Accounts payable 17,065us-gaap_AccountsPayableCurrent 19,373us-gaap_AccountsPayableCurrent
Insurance and claims accruals 13,998us-gaap_AccruedInsuranceCurrent 14,404us-gaap_AccruedInsuranceCurrent
Accrued liabilities 12,710us-gaap_AccruedLiabilitiesCurrent 19,251us-gaap_AccruedLiabilitiesCurrent
Total current liabilities 44,518us-gaap_LiabilitiesCurrent 53,028us-gaap_LiabilitiesCurrent
Long-term debt 24,373us-gaap_LongTermDebtNoncurrent  
Deferred income taxes 122,843us-gaap_DeferredTaxLiabilitiesNoncurrent 113,637us-gaap_DeferredTaxLiabilitiesNoncurrent
Total liabilities 191,734us-gaap_Liabilities 166,665us-gaap_Liabilities
Commitments and contingencies (Note 14)      
Stockholders’ equity:    
Preferred stock, $.01 par value per share; 2,000,000 shares authorized; no shares issued and outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, $.01 par value per share; 48,000,000 shares authorized; 33,418,829 shares at December 31, 2014, and 33,301,048 shares at December 31, 2013, issued and outstanding 334us-gaap_CommonStockValue 333us-gaap_CommonStockValue
Additional paid-in capital 87,370us-gaap_AdditionalPaidInCapitalCommonStock 85,077us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 300,222us-gaap_RetainedEarningsAccumulatedDeficit 273,727us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity 387,926us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 359,137us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
579,660us-gaap_LiabilitiesAndStockholdersEquity 525,802us-gaap_LiabilitiesAndStockholdersEquity
Revenue Equipment [Member]    
Property and equipment:    
Property and equipment 535,091us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mrtn_RevenueEquipmentMember		 496,133us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mrtn_RevenueEquipmentMember
Land and Building [Member]    
Property and equipment:    
Property and equipment 71,105us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember		 52,213us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
Office Equipment and Other [Member]    
Property and equipment:    
Property and equipment $ 39,776us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mrtn_OfficeEquipmentAndOtherMember		 $ 31,579us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= mrtn_OfficeEquipmentAndOtherMember