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Geographic Information (Long-Lived Assets By Geographic Areas) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Long-Lived Assets	$ 775,837us-gaap_AssetsNoncurrent	$ 667,323us-gaap_AssetsNoncurrent	$ 529,176us-gaap_AssetsNoncurrent
United States [Member]
Segment Reporting Information [Line Items]
Long-Lived Assets	725,189us-gaap_AssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = country_US	632,783us-gaap_AssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = country_US	495,609us-gaap_AssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = country_US
Canada [Member]
Segment Reporting Information [Line Items]
Long-Lived Assets	37,580us-gaap_AssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = country_CA	22,572us-gaap_AssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = country_CA	15,954us-gaap_AssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = country_CA
Other Foreign Countries [Member]
Segment Reporting Information [Line Items]
Long-Lived Assets	$ 13,068us-gaap_AssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = fast_OtherCountriesMember	$ 11,968us-gaap_AssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = fast_OtherCountriesMember	$ 17,613us-gaap_AssetsNoncurrent / us-gaap_StatementBusinessSegmentsAxis = fast_OtherCountriesMember

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5



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 210.5-02.10-17)

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

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