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Information Regarding Reportable Business Segments (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
Segment Reporting Information [Line Items] |  |  |
External revenue from continuing operations | $ 3,184,790 us-gaap_Revenues | $ 2,664,780 us-gaap_Revenues | $ 2,770,799 us-gaap_Revenues
Internal revenue | 28,164 us-gaap_RevenueFromRelatedParties | 28,811 us-gaap_RevenueFromRelatedParties | 28,446 us-gaap_RevenueFromRelatedParties
Investment income | 1,381 us-gaap_InterestIncomeOperating | 1,475 us-gaap_InterestIncomeOperating | 1,563 us-gaap_InterestIncomeOperating
Interest and debt expense from continuing operations | 3,177 us-gaap_InterestAndDebtExpense | 3,211 us-gaap_InterestAndDebtExpense | 3,110 us-gaap_InterestAndDebtExpense
Depreciation and amortization from continuing operations | 27,575 us-gaap_DepreciationAndAmortization | 27,667 us-gaap_DepreciationAndAmortization | 25,213 us-gaap_DepreciationAndAmortization
Operating income from continuing operations | 224,372 us-gaap_OperatingIncomeLoss | 176,590 us-gaap_OperatingIncomeLoss | 200,739 us-gaap_OperatingIncomeLoss
Expenditures on long-lived assets from continuing operations | 10,539 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 6,373 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 5,388 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Goodwill | 31,134 us-gaap_Goodwill | 31,134 us-gaap_Goodwill | 57,470 us-gaap_Goodwill
Capital lease additions | 47,232 us-gaap_CapitalLeaseObligationsIncurred | 49,138 us-gaap_CapitalLeaseObligationsIncurred | 43,077 us-gaap_CapitalLeaseObligationsIncurred
Total assets | 1,044,212 us-gaap_Assets | 970,696 us-gaap_Assets | 879,421 us-gaap_Assets
Transportation Logistics |  |  |
Segment Reporting Information [Line Items] |  |  |
External revenue from continuing operations | 3,145,413 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 2,628,225 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 2,734,938 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember
Interest and debt expense from continuing operations | 3,177 us-gaap_InterestAndDebtExpense / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 3,211 us-gaap_InterestAndDebtExpense / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 3,110 us-gaap_InterestAndDebtExpense / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember
Depreciation and amortization from continuing operations | 27,575 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 27,667 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 25,213 us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember
Operating income from continuing operations | 193,914 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 151,188 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 167,626 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember
Expenditures on long-lived assets from continuing operations | 10,539 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 6,373 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 5,388 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember
Goodwill | 31,134 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 31,134 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 57,470 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember
Capital lease additions | 47,232 us-gaap_CapitalLeaseObligationsIncurred / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 49,138 us-gaap_CapitalLeaseObligationsIncurred / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 43,077 us-gaap_CapitalLeaseObligationsIncurred / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember
Total assets | 917,789 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 754,904 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember | 708,233 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember
Insurance |  |  |
Segment Reporting Information [Line Items] |  |  |
External revenue from continuing operations | 39,377 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember | 36,555 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember | 35,861 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember
Internal revenue | 28,164 us-gaap_RevenueFromRelatedParties / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember | 28,811 us-gaap_RevenueFromRelatedParties / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember | 28,446 us-gaap_RevenueFromRelatedParties / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember
Investment income | 1,381 us-gaap_InterestIncomeOperating / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember | 1,475 us-gaap_InterestIncomeOperating / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember | 1,563 us-gaap_InterestIncomeOperating / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember
Operating income from continuing operations | 30,458 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember | 25,402 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember | 33,113 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember
Total assets | $ 126,423 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember | $ 215,792 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember | $ 171,188 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lstr_InsuranceMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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