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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

X

- 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

X

- 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