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Segment Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 27, 2014
Segment
Customer
Dec. 28, 2013
Customer
Dec. 29, 2012
Customer
Segment Reporting Information [Line Items]      
External revenue $ 3,184,790us-gaap_Revenues $ 2,664,780us-gaap_Revenues $ 2,770,799us-gaap_Revenues
Number of segments 2us-gaap_NumberOfOperatingSegments    
Number of customers accounting for 10 percent or more of total revenue 0lstr_NumberOfCustomersAccountingFor10PercentOrMoreOfTotalRevenue 0lstr_NumberOfCustomersAccountingFor10PercentOrMoreOfTotalRevenue 0lstr_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 1,044,212us-gaap_Assets 970,696us-gaap_Assets 879,421us-gaap_Assets
Goodwill 31,134us-gaap_Goodwill 31,134us-gaap_Goodwill 57,470us-gaap_Goodwill
Transportation Logistics      
Segment Reporting Information [Line Items]      
External revenue 3,145,413us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= lstr_TransportationLogisticsMember
2,628,225us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= lstr_TransportationLogisticsMember
2,734,938us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= lstr_TransportationLogisticsMember
Total assets 917,789us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= lstr_TransportationLogisticsMember
754,904us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= lstr_TransportationLogisticsMember
708,233us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= lstr_TransportationLogisticsMember
Goodwill 31,134us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lstr_TransportationLogisticsMember
31,134us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lstr_TransportationLogisticsMember
57,470us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lstr_TransportationLogisticsMember
Transportation Logistics | Discontinued Operations      
Segment Reporting Information [Line Items]      
Total assets     100,972us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= lstr_TransportationLogisticsMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember
Goodwill     $ 26,336us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lstr_TransportationLogisticsMember
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember