CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 25, 2011	Jun. 30, 2012	Jun. 25, 2011
Revenue	$ 735,973	$ 675,561	$ 1,384,996	$ 1,247,547
Investment income	405	393	792	921
Costs and expenses:
Purchased transportation	562,781	509,982	1,055,703	941,360
Commissions to agents	56,460	54,004	106,692	98,175
Other operating costs	4,716	7,679	11,188	15,623
Insurance and claims	9,306	13,449	20,401	24,715
Selling, general and administrative	37,662	35,782	76,461	73,046
Depreciation and amortization	6,664	6,388	13,404	12,787
Total costs and expenses	677,589	627,284	1,283,849	1,165,706
Operating income	58,789	48,670	101,939	82,762
Interest and debt expense	770	777	1,494	1,605
Income before income taxes	58,019	47,893	100,445	81,157
Income taxes	22,164	18,295	37,743	31,002
Net income	35,855	29,598	62,702	50,155
Less: Net loss attributable to noncontrolling interest				(62)
Net income attributable to Landstar System, Inc. and subsidiary	$ 35,855	$ 29,598	$ 62,702	$ 50,217
Earnings per common share attributable to Landstar System, Inc. and subsidiary	$ 0.76	$ 0.62	$ 1.34	$ 1.05
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary	$ 0.76	$ 0.62	$ 1.33	$ 1.05
Average number of shares outstanding:
Earnings per common share	46,915,000	47,782,000	46,856,000	47,826,000
Diluted earnings per share	47,104,000	47,912,000	47,083,000	47,907,000
Dividends paid per common share	$ 0.055	$ 0.050	$ 0.110	$ 0.100