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Acquired Business and Noncontrolling Interests - Additional Information (Detail) - USD ($)
12 Months Ended
Sep. 20, 2017
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Goodwill   $ 38,508,000 $ 38,232,000 $ 39,065,000
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   $ 7,900,000,000    
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%