Information Regarding Reportable Business Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012	Dec. 29, 2012
Segment Reporting Information [Line Items]
External revenue	$ 679,340	$ 735,973	$ 1,307,661	$ 1,384,996
Investment income	371	405	745	792
Internal revenue	10,809	10,481	16,809	16,467
Operating income	49,937	58,789	93,399	101,939
Expenditures on long-lived assets	1,027	1,956	2,749	2,982
Goodwill	57,470	57,470	57,470	57,470	57,470
Transportation Logistics
Segment Reporting Information [Line Items]
External revenue	670,278	727,142	1,289,559	1,367,394
Operating income	42,443	49,732	78,985	86,128
Expenditures on long-lived assets	1,027	1,956	2,749	2,982
Goodwill	57,470	57,470	57,470	57,470
Insurance
Segment Reporting Information [Line Items]
External revenue	9,062	8,831	18,102	17,602
Investment income	371	405	745	792
Internal revenue	10,809	10,481	16,809	16,467
Operating income	$ 7,494	$ 9,057	$ 14,414	$ 15,811

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

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Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

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The net result for the period of deducting operating expenses from operating revenues.

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Related Parties

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-Subparagraph (SX 210.6-07.1(c))

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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