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Long-Lived Assets (Details) (USD $) In Thousands, unless otherwise specified															12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Land [Member]	Dec. 31, 2012 Land [Member]	Dec. 31, 2013 Buildings And Improvements [Member]	Dec. 31, 2012 Buildings And Improvements [Member]	Dec. 31, 2013 Automated Storage And Retrieval Equipment [Member]	Dec. 31, 2012 Automated Storage And Retrieval Equipment [Member]	Dec. 31, 2013 Equipment And Shelving [Member]	Dec. 31, 2012 Equipment And Shelving [Member]	Dec. 31, 2013 Transportation Equipment [Member]	Dec. 31, 2012 Transportation Equipment [Member]	Dec. 31, 2013 Construction In Progress [Member]	Dec. 31, 2012 Construction In Progress [Member]	Dec. 31, 2013 Minimum [Member] Buildings And Improvements [Member]	Dec. 31, 2013 Minimum [Member] Automated Storage And Retrieval Equipment [Member]	Dec. 31, 2013 Minimum [Member] Equipment And Shelving [Member]	Dec. 31, 2013 Minimum [Member] Transportation Equipment [Member]	Dec. 31, 2013 Maximum [Member] Buildings And Improvements [Member]	Dec. 31, 2013 Maximum [Member] Automated Storage And Retrieval Equipment [Member]	Dec. 31, 2013 Maximum [Member] Equipment And Shelving [Member]	Dec. 31, 2013 Maximum [Member] Transportation Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 1,019,902	$ 840,078	$ 36,644	$ 31,831	$ 216,852	$ 200,439	$ 98,474	$ 69,404	$ 462,224	$ 398,240	$ 57,536	$ 52,093	$ 148,172	$ 88,071
Less accumulated depreciation	(365,052)	(323,651)
Net property and equipment	$ 654,850	$ 516,427
Depreciable life in years															15 years	5 years	3 years	3 years	40 years	30 years	10 years	5 years

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5

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X

- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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