Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2011

Comprehensive Income [Abstract]

Components Of Comprehensive Income

	Fiscal Year
	2011			2010			2009
Net income attributable to Landstar System, Inc. and subsidiary	$	113,007		$	87,514		$	70,395
Unrealized holding gains on available-for-sale investments		26			312			791
Income tax expense on unrealized holding gains on available-for-sale investments		(9	)		(111	)		(279	)
Net unrealized holding gains on available-for-sale investments		17			201			512
Foreign currency translation gains (losses)		(171	)		182			547
Comprehensive income attributable to Landstar System, Inc. and subsidiary	$	112,853		$	87,897		$	71,454