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Retirement Plan
12 Months Ended
Dec. 31, 2011
Retirement Plan [Abstract]  
Retirement Plan
(7) Retirement Plan

Landstar sponsors an Internal Revenue Code section 401(k) defined contribution plan for the benefit of full-time employees who have completed one year of service. Eligible employees make voluntary contributions up to 75% of their base salary, subject to certain limitations. Landstar contributes an amount equal to 100% of the first 3% and 50% of the next 2% of such contributions, subject to certain limitations.

The expense for the Company-sponsored defined contribution plan included in selling, general and administrative expense was $1,754,000 in 2011, $1,663,000 in 2010 and $1,598,000 in 2009.