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Operating Leases - Additional Information (Details) (Leased Vehicles [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Property Subject to or Available for Operating Lease [Line Items] |
Term of non-cancellable pick-up leases | 1 year
Aggregate residual value guarantee | $ 62,418 us-gaap_GuaranteeObligationsMaximumExposure
Minimum [Member] |
Property Subject to or Available for Operating Lease [Line Items] |
Average pick-up lease term | 28 months
Maximum [Member] |
Property Subject to or Available for Operating Lease [Line Items] |
Renewal options for non-cancellable pick-up leases, maximum | 72 months
Average pick-up lease term | 36 months

X
- Definition Term Of Noncancellable Lease + References No definition available. + Details
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Namespace Prefix: | fast_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration