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Leases - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
Leases Disclosure [Line Items] |  |  |
Total rent expense/income from continuing operations, net of sublease income | $ 587,000 us-gaap_OperatingLeasesRentExpenseNet | $ 1,238,000 us-gaap_OperatingLeasesRentExpenseNet | $ 497,000 us-gaap_OperatingLeasesRentExpenseNet

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

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration