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Leases - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Leases Disclosure [Line Items] |  |  |
Rent income, net of rent expense | $ 868,000 | $ 1,419,000 | $ 1,641,000

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- Definition Leases Disclosure [Line Items] + References No definition available. + Details
Name: | lstr_LeasesDisclosureLineItems
Namespace Prefix: | lstr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Rental income for the reporting period under operating leases net of related rental income expense. + References No definition available. + Details
Name: | lstr_OperatingLeasesRentIncomeExpenseNet
Namespace Prefix: | lstr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration