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Financial Instruments And Marketable Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Financial Instruments And Marketable Securities [Line Items] |  |
Dollar value of transfers between levels | $ 0 | $ 0

X
- Details
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Namespace Prefix: | fast_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Marketable Security Level Transfers + References No definition available. + Details
Name: | fast_MarketableSecurityLevelTransfers
Namespace Prefix: | fast_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration