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Commitments and Contingencies - Additional Information (Detail) | 12 Months Ended
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Dec. 29, 2018 USD ($)
Commitments and Contingencies Disclosure [Line Items] |
Consideration paid to purchase remaining equity interest | $ 600,000
Fletes Avella | Landstar Metro |
Commitments and Contingencies Disclosure [Line Items] |
Approximate ownership interest acquired by affiliates | 21.00%
Fletes Avella | Landstar Servicios |
Commitments and Contingencies Disclosure [Line Items] |
Approximate ownership interest acquired by affiliates | 21.00%
Revolving Credit Facility |
Commitments and Contingencies Disclosure [Line Items] |
Letters of credit outstanding | $ 62,345,000
Guarantee Payment of Insurance Claims |
Commitments and Contingencies Disclosure [Line Items] |
Letters of credit outstanding | $ 62,345,000

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