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Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
Significant Accounting Policies [Line Items] |  |  |
Stock options excluded from calculation of diluted earnings per share, antidilutive | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 143,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 321,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Dividends payable per share | $ 1.00 us-gaap_DividendsPayableAmountPerShare | $ 0.35 us-gaap_DividendsPayableAmountPerShare |
Dividend payable date | Jan. 26, 2015 | Jan. 16, 2014 |
Dividend record date | Jan. 12, 2015 | Dec. 27, 2013 |
Dividends payable | $ 44,794,000 us-gaap_DividendsPayableCurrent | $ 15,921,000 us-gaap_DividendsPayableCurrent |
Dividend declared date | Dec. 04, 2014 | Dec. 11, 2013 |
Buildings And Improvements |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciated life | 30 years |  |
Trailing Equipment | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciated life | 7 years |  |
Trailing Equipment | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciated life | 10 years |  |
Hardware And Software | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciated life | 3 years |  |
Hardware And Software | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciated life | 7 years |  |
Commercial Trucking Claims |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained liability per claim | 5,000,000 lstr_SelfInsuranceRetainedLiability / lstr_SelfInsurancePerOccurrenceAxis = lstr_CommercialTruckingClaimsMember |  |
General Liability Claim |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained liability per claim | 1,000,000 lstr_SelfInsuranceRetainedLiability / lstr_SelfInsurancePerOccurrenceAxis = lstr_GeneralLiabilityClaimMember |  |
Workers' Compensation Claim |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained liability per claim | 250,000 lstr_SelfInsuranceRetainedLiability / lstr_SelfInsurancePerOccurrenceAxis = lstr_WorkersCompensationClaimMember |  |
Cargo Claim |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained liability per claim | $ 250,000 lstr_SelfInsuranceRetainedLiability / lstr_SelfInsurancePerOccurrenceAxis = lstr_CargoClaimMember |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the dividend to be paid was declared, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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