Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Net income attributable to Landstar System, Inc. and subsidiary	$ 53,255	$ 66,985	$ 177,672	$ 187,025
Other comprehensive income (loss):
Unrealized holding gains (losses) on available-for-sale investments, net of tax expense (benefit) of $577, ($231), $83 and $2	307	7	2,112	(876)
Foreign currency translation gains (losses)	(1,083)	708	42	(531)
Other comprehensive income (loss)	(776)	715	2,154	(1,407)
Comprehensive income attributable to Landstar System, Inc. and subsidiary	$ 52,479	$ 67,700	$ 179,826	$ 185,618