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New Revenue Standard Requirements Impact of Adoption on Consolidated Income Statement and Balance Sheet (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 30, 2017
Revenues            
Revenues $ 1,202,081 $ 943,430 $ 3,432,793 $ 2,594,772    
Costs and expenses            
Purchased transportation 931,473 726,827 2,658,710 1,989,938    
Commissions to agents 99,304 76,598 275,828 210,678    
Income taxes 19,304 17,490 56,279 59,047    
Net income attributable to Landstar System, Inc. and subsidiary 66,985 42,443 187,025 112,336    
ASSETS            
Trade accounts receivable, net 702,183   702,183   $ 641,043 $ 631,164
Other current assets 24,191   24,191   13,925 14,394
Liabilities            
Accounts payable 313,728   313,728   293,769 285,132
Equity            
Retained earnings 1,779,680   1,779,680   1,611,931 1,611,158
Transportation Logistics            
Revenues            
Revenues 1,188,737 931,692 3,394,298 2,559,847    
Insurance            
Revenues            
Revenues 13,344 $ 11,738 38,495 $ 34,925    
Calculated under Revenue Guidance in Effect before Topic 606            
Costs and expenses            
Purchased transportation     2,655,491      
Commissions to agents     275,538      
Income taxes     56,145      
Net income attributable to Landstar System, Inc. and subsidiary     186,612      
ASSETS            
Trade accounts receivable, net 688,248   688,248     631,164
Other current assets 24,794   24,794     14,394
Liabilities            
Accounts payable 301,582   301,582     285,132
Equity            
Retained earnings 1,778,494   1,778,494     $ 1,611,158
Calculated under Revenue Guidance in Effect before Topic 606 | Transportation Logistics            
Revenues            
Revenues     3,390,242      
Calculated under Revenue Guidance in Effect before Topic 606 | Insurance            
Revenues            
Revenues     38,495      
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09            
Costs and expenses            
Purchased transportation     3,219      
Commissions to agents     290      
Income taxes     134      
Net income attributable to Landstar System, Inc. and subsidiary     413      
ASSETS            
Trade accounts receivable, net 13,935   13,935   9,879  
Other current assets (603)   (603)   (469)  
Liabilities            
Accounts payable 12,146   12,146   8,637  
Equity            
Retained earnings $ 1,186   1,186   $ 773  
Difference between Revenue Guidance in Effect before and after Topic 606 | Transportation Logistics | Accounting Standards Update 2014-09            
Revenues            
Revenues     $ 4,056