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Commitments and Contingencies - Additional Information (Detail) (USD $) | Dec. 27, 2014
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Revolving Credit Facility |
Commitments and Contingencies Disclosure [Line Items] |
Letters of credit outstanding | $ 33,042,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Guarantee Payment Of Insurance Claims |
Commitments and Contingencies Disclosure [Line Items] |
Letters of credit outstanding | $ 63,761,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_GuaranteeObligationsByNatureAxis = lstr_GuaranteePaymentOfInsuranceClaimsMember

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- Details
Name: | lstr_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | lstr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=lstr_GuaranteePaymentOfInsuranceClaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |