XML 19 R68.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Note 18 - Revenue and Business Segments - Operating Revenue and Operating Income by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating revenue | $ 217,185 | $ 214,973 | $ 212,090 | $ 199,023 | $ 203,961 | $ 199,649 | $ 197,024 | $ 186,960 | $ 843,271 | $ 787,594 | $ 698,120
Operating income | $ 18,787 | $ 20,034 | $ 19,944 | $ 17,733 | $ 19,538 | $ 18,993 | $ 18,223 | $ 13,594 | 76,498 | 70,348 | 56,862
Truckload [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 378,000 | 375,340 | 380,210
Operating income |  |  |  |  |  |  |  |  | 29,666 | 35,067 | 26,326
Truckload [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 329,304 | 322,324 | 336,596
Truckload [Member] | Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 48,696 | 53,016 | 43,614
Dedicated [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 265,984 | 223,852 | 166,881
Operating income |  |  |  |  |  |  |  |  | 31,245 | 18,589 | 17,074
Dedicated [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 223,935 | 187,137 | 153,691
Dedicated [Member] | Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 42,049 | 36,715 | 13,190
Intermodal [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 90,394 | 102,025 | 80,621
Operating income |  |  |  |  |  |  |  |  | 6,612 | 11,150 | 8,303
Intermodal [Member] | Revenue, Net of Fuel Surcharge [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 77,750 | 85,572 | 70,282
Intermodal [Member] | Fuel Surcharge Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 12,644 | 16,453 | 10,339
Brokerage [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  |  |  |  | 108,893 | 86,377 | 70,408
Operating income |  |  |  |  |  |  |  |  | $ 8,975 | $ 5,542 | $ 5,159

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mrtn_TruckloadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mrtn_RevenueNetOfFuelSurchargeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=mrtn_FuelSurchargeRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mrtn_DedicatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mrtn_IntermodalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mrtn_BrokerageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |