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Acquired Business and Noncontrolling Interests - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 20, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Goodwill |  | $ 38,232,000 | $ 39,065,000 | $ 31,134,000
Contigent consideration liability remitted |  | $ 1,000,000 |  |
Approximate percentage of voting rights acquired |  | 9.00% |  |
Consideration paid to purchase remaining equity interest |  | $ 600,000 |  |
Fletes Avella |  |  |  |
Contigent consideration liability negated |  | $ 900,000 |  |
Fletes Avella | Landstar Metro |  |  |  |
Payments to acquire businesses, gross | $ 8,460,000 |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, liabilities |  |  | 1,900,000 |
Approximate ownership interest acquired by affiliates |  | 21.00% |  |
Goodwill |  | $ 7,900,000 |  |
Percentage of goodwill estimated to be deductible after purchase of noncontrolling interests by the company |  | 100.00% |  |
One-time costs related to completion of acquisition |  |  | $ 1,000,000 |
One-time costs related to completion of acquisition, per share |  |  | $ 0.01 |
One-time costs related to completion of acquisition, per share diluted |  |  | $ 0.01 |
Fletes Avella | Landstar Servicios |  |  |  |
Approximate ownership interest acquired by affiliates |  | 21.00% |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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