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Commitments and Contingencies (Details) (Unsecured Debt [Member], Revolving Credit Facility [Member], USD $) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013
Line of Credit Facility [Line Items] |  |
Revolving credit facility, maximum borrowing capacity | $ 170,000,000 |
Line of credit, amount outstanding | 70,000,000 | 0
Average Quarterly Utilization of Facility is Less than 20% [Member] |  |
Line of Credit Facility [Line Items] |  |
Percentage fee paid for unused portion of revolving credit facility | 0.125% |
Average Quarterly Utilization of Facility is 20% or More [Member] |  |
Line of Credit Facility [Line Items] |  |
Percentage fee paid for unused portion of revolving credit facility | 0.10% |
One-Month London Interbank Offer Rate, Reset Daily [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest percentage over LIBOR rate | 0.875% |
One-Month, Two-Month, Three-Month, Six-Month, or Twelve-Month London Interbank Offer Rate [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest percentage over LIBOR rate | 0.875% |
Letter of Credit Subfacility [Member] |  |
Line of Credit Facility [Line Items] |  |
Revolving credit facility, maximum borrowing capacity | 40,000,000 |
Face amount of outstanding undrawn letters of credit | $ 34,411,000 | $ 29,250,000
Percentage fee paid for unused portion of revolving credit facility | 0.875% |
Revolving credit facility, issuance fee as percent of face amount | 0.075% |
Swing Line Loan [Member] | One-Month London Interbank Offer Rate, Reset Daily [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest percentage over LIBOR rate | 0.875% |

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- Definition Line of Credit Facility, Issuance Fee as Percent of Face Amount + References No definition available. + Details
Name: | fast_LineOfCreditFacilityIssuanceFeeAsPercentOfFaceAmount
Namespace Prefix: | fast_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration