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Minimum Lease Payments (Parenthetical) (Detail)
 12 Months Ended
Dec. 27, 2014
Minimum  
Capital Leases And Operating Leases [Line Items]  
Capital leases, future minimum payments, interest included in payments, interest rate 2.00%lstr_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsInterestRate
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Maximum  
Capital Leases And Operating Leases [Line Items]  
Capital leases, future minimum payments, interest included in payments, interest rate 3.90%lstr_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPaymentsInterestRate
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= us-gaap_MaximumMember