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Commitments and Contingencies (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Line of Credit Facility [Line Items] |  |
Line of credit, amount outstanding | $ 90,000,000 us-gaap_LinesOfCreditCurrent | $ 0 us-gaap_LinesOfCreditCurrent
Unsecured Debt [Member] | Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Revolving credit facility, maximum borrowing capacity | 230,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Line of credit, amount outstanding | 90,000,000 us-gaap_LinesOfCreditCurrent / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 0 us-gaap_LinesOfCreditCurrent / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember
Effective interest rate during period on outstanding loans | 1.10%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Unsecured Debt [Member] | Revolving Credit Facility [Member] | Average Quarterly Utilization of Facility is Less than 20% [Member] |  |
Line of Credit Facility [Line Items] |  |
Percentage fee paid for undrawn portion of revolving credit facility | 0.125%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember / fast_TriggeringEventsAxis = fast_AverageQuarterlyUtilizationofFacilityisLessthan20Member |
Unsecured Debt [Member] | Revolving Credit Facility [Member] | Average Quarterly Utilization of Facility is 20% or More [Member] |  |
Line of Credit Facility [Line Items] |  |
Percentage fee paid for undrawn portion of revolving credit facility | 0.10%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember / fast_TriggeringEventsAxis = fast_AverageQuarterlyUtilizationofFacilityis20orMoreMember |
Unsecured Debt [Member] | Revolving Credit Facility [Member] | One-Month London Interbank Offer Rate, Reset Daily [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest percentage over LIBOR rate | 0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = fast_OneMonthLondonInterbankOfferRateResetDailyMember |
Unsecured Debt [Member] | Revolving Credit Facility [Member] | One-Month, Two-Month, Three-Month, Six-Month, or Twelve-Month London Interbank Offer Rate, Reset at End of Selected Interest Period [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest percentage over LIBOR rate | 0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = fast_OneMonthTwoMonthThreeMonthSixMonthOrTwelveMonthLondonInterbankOfferRateMember |
Unsecured Debt [Member] | Revolving Credit Facility [Member] | Letter of Credit Subfacility [Member] |  |
Line of Credit Facility [Line Items] |  |
Revolving credit facility, maximum borrowing capacity | 45,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Face amount of outstanding undrawn letters of credit | $ 37,315,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember | $ 34,415,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember
Percentage fee paid for undrawn portion of revolving credit facility | 0.875%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Revolving credit facility, issuance fee as percent of face amount | 0.075%fast_LineOfCreditFacilityIssuanceFeeAsPercentOfFaceAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Unsecured Debt [Member] | Revolving Credit Facility [Member] | Swing Line Loans [Member] | One-Month London Interbank Offer Rate, Reset Daily [Member] |  |
Line of Credit Facility [Line Items] |  |
Interest percentage over LIBOR rate | 0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_BridgeLoanMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = fast_OneMonthLondonInterbankOfferRateResetDailyMember |

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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 average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 210.5-02.20) -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, 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
Name: | us-gaap_LinesOfCreditCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |