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Operating Leases - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Property Subject to or Available for Operating Lease [Line Items]
Leasehold improvements, net book value	$ 1,732us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet
Amortization period of leasehold improvements on operating leases	36 months
Certain Store Locations [Member] | Minimum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Average lease term	1 month
Certain Store Locations [Member] | Maximum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Average lease term	84 months
Most Store Locations [Member] | Minimum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Average lease term	36 months
Most Store Locations [Member] | Maximum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Average lease term	48 months
Semi-Tractor [Member] | Minimum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Average lease term	48 months
Semi-Tractor [Member] | Maximum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Average lease term	60 months
Leased Vehicles [Member]
Property Subject to or Available for Operating Lease [Line Items]
Term of non-cancellable pick-up leases	1 year
Aggregate residual value guarantee	$ 50,130us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_VehiclesMember
Leased Vehicles [Member] | Minimum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Average lease term	28 months
Leased Vehicles [Member] | Maximum [Member]
Property Subject to or Available for Operating Lease [Line Items]
Average lease term	36 months
Renewal options for non-cancellable pick-up leases, maximum	72 months

X

- Definition

Leasehold Improvements On Operating Leases Amortization Period

+ References

No definition available.

+ Details

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- Definition

Term Of Noncancellable Lease

+ References

No definition available.

+ Details

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X

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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X

- Definition

Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718

+ Details

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- Details

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- Details

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