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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands | Dec. 30, 2017 | Sep. 20, 2017
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Fletes Avella | Landstar Metro |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Ownership interest acquired by affiliates |  | 30.00%
Fletes Avella | Landstar Servicios |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Ownership interest acquired by affiliates |  | 30.00%
Revolving Credit Facility |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Letters of credit outstanding | $ 33,124 |
Guarantee Payment of Insurance Claims |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Letters of credit outstanding | $ 59,436 |

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