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Effect of Increase in Cost of Insurance and Claims (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
Change in Accounting Estimate [Line Items] |  |  |
Operating income | $ 224,372 us-gaap_OperatingIncomeLoss | $ 176,590 us-gaap_OperatingIncomeLoss | $ 200,739 us-gaap_OperatingIncomeLoss
Income from continuing operations | 138,809 us-gaap_IncomeLossFromContinuingOperations | 108,922 us-gaap_IncomeLossFromContinuingOperations | 126,566 us-gaap_IncomeLossFromContinuingOperations
Earnings per share from continuing operations | $ 3.09 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 2.37 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 2.71 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted earnings per share from continuing operations | $ 3.07 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 2.36 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 2.70 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Development of Prior Year Self Insured Claims Estimates |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Operating income | 6,664 us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = lstr_DevelopmentOfPriorYearSelfInsuredClaimsEstimatesMember | 10,909 us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = lstr_DevelopmentOfPriorYearSelfInsuredClaimsEstimatesMember | 11 us-gaap_OperatingIncomeLoss / us-gaap_ChangeInAccountingEstimateByTypeAxis = lstr_DevelopmentOfPriorYearSelfInsuredClaimsEstimatesMember
Income from continuing operations | $ 4,118 us-gaap_IncomeLossFromContinuingOperations / us-gaap_ChangeInAccountingEstimateByTypeAxis = lstr_DevelopmentOfPriorYearSelfInsuredClaimsEstimatesMember | $ 6,742 us-gaap_IncomeLossFromContinuingOperations / us-gaap_ChangeInAccountingEstimateByTypeAxis = lstr_DevelopmentOfPriorYearSelfInsuredClaimsEstimatesMember | $ 7 us-gaap_IncomeLossFromContinuingOperations / us-gaap_ChangeInAccountingEstimateByTypeAxis = lstr_DevelopmentOfPriorYearSelfInsuredClaimsEstimatesMember
Earnings per share from continuing operations | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare / us-gaap_ChangeInAccountingEstimateByTypeAxis = lstr_DevelopmentOfPriorYearSelfInsuredClaimsEstimatesMember | $ 0.15 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare / us-gaap_ChangeInAccountingEstimateByTypeAxis = lstr_DevelopmentOfPriorYearSelfInsuredClaimsEstimatesMember |
Diluted earnings per share from continuing operations | $ 0.09 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare / us-gaap_ChangeInAccountingEstimateByTypeAxis = lstr_DevelopmentOfPriorYearSelfInsuredClaimsEstimatesMember | $ 0.15 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare / us-gaap_ChangeInAccountingEstimateByTypeAxis = lstr_DevelopmentOfPriorYearSelfInsuredClaimsEstimatesMember |

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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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