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Segment Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 27, 2014 Segment Customer | Dec. 28, 2013 Customer | Dec. 29, 2012 Customer
Segment Reporting Information [Line Items] |  |  |
External revenue | $ 3,184,790 us-gaap_Revenues | $ 2,664,780 us-gaap_Revenues | $ 2,770,799 us-gaap_Revenues
Number of segments | 2 us-gaap_NumberOfOperatingSegments |  |
Number of customers accounting for 10 percent or more of total revenue | 0 lstr_NumberOfCustomersAccountingFor10PercentOrMoreOfTotalRevenue | 0 lstr_NumberOfCustomersAccountingFor10PercentOrMoreOfTotalRevenue | 0 lstr_NumberOfCustomersAccountingFor10PercentOrMoreOfTotalRevenue
No single customer accounted for benchmark percentage to be considered major customer | 10.00%lstr_EntityWideRevenueNoMajorCustomerAccountedForBenchmarkPercentage | 10.00%lstr_EntityWideRevenueNoMajorCustomerAccountedForBenchmarkPercentage | 10.00%lstr_EntityWideRevenueNoMajorCustomerAccountedForBenchmarkPercentage
Total assets | 1,044,212 us-gaap_Assets | 970,696 us-gaap_Assets | 879,421 us-gaap_Assets
Goodwill | 31,134 us-gaap_Goodwill | 31,134 us-gaap_Goodwill | 57,470 us-gaap_Goodwill
Transportation Logistics |  |  |
Segment Reporting Information [Line Items] |  |  |
External revenue | 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
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
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
Transportation Logistics | Discontinued Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets |  |  | 100,972 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Goodwill |  |  | $ 26,336 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lstr_TransportationLogisticsMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember

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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
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- Definition Number of Customers Accounting for 10 Percent Or More Of Total Revenue + References No definition available. + Details
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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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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Details
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