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Long-Lived Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property and Equipment, Net [Line Items]
Property and equipment	$ 1,498,835	$ 1,324,923
Less accumulated depreciation	(599,138)	(506,034)
Property and equipment, net	899,697	818,889
Land [Member]
Property and Equipment, Net [Line Items]
Property and equipment	37,339	37,671
Buildings And Improvements [Member]
Property and Equipment, Net [Line Items]
Property and equipment	297,093	271,302
Automated Distribution And Warehouse Equipment [Member]
Property and Equipment, Net [Line Items]
Property and equipment	216,276	204,708
Shelving, Industrial Vending, And Equipment [Member]
Property and Equipment, Net [Line Items]
Property and equipment	723,854	548,921
Transportation Equipment [Member]
Property and Equipment, Net [Line Items]
Property and equipment	71,750	61,429
Construction In Progress [Member]
Property and Equipment, Net [Line Items]
Property and equipment	$ 152,523	$ 200,892
Minimum [Member] | Buildings And Improvements [Member]
Property and Equipment, Net [Line Items]
Depreciable life in years	15 years
Minimum [Member] | Automated Distribution And Warehouse Equipment [Member]
Property and Equipment, Net [Line Items]
Depreciable life in years	5 years
Minimum [Member] | Shelving, Industrial Vending, And Equipment [Member]
Property and Equipment, Net [Line Items]
Depreciable life in years	3 years
Minimum [Member] | Transportation Equipment [Member]
Property and Equipment, Net [Line Items]
Depreciable life in years	3 years
Maximum [Member] | Buildings And Improvements [Member]
Property and Equipment, Net [Line Items]
Depreciable life in years	40 years
Maximum [Member] | Automated Distribution And Warehouse Equipment [Member]
Property and Equipment, Net [Line Items]
Depreciable life in years	30 years
Maximum [Member] | Shelving, Industrial Vending, And Equipment [Member]
Property and Equipment, Net [Line Items]
Depreciable life in years	10 years
Maximum [Member] | Transportation Equipment [Member]
Property and Equipment, Net [Line Items]
Depreciable life in 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

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- 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

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-Topic 210
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+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 210
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 360
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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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- 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

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