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v2.4.1.9

Subsequent Events Additional Information (Details) (Unsecured Debt [Member], Revolving Credit Facility [Member], USD $) | 3 Months Ended | 0 Months Ended
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Mar. 31, 2015 | Apr. 13, 2015
Subsequent Event [Line Items] |  |
Revolving credit facility, maximum borrowing capacity | $ 230,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |
Interest percentage over LIBOR rate | 0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 |
Subsequent Event [Member] |  |
Subsequent Event [Line Items] |  |
Revolving credit facility, maximum borrowing capacity |  | 400,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Interest percentage over LIBOR rate |  | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Letter of Credit Subfacility [Member] |  |
Subsequent Event [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 |
Letter of credit subfacility, commission fee as a percent of face amount | 0.875%fast_LetterOfCreditSubFacilityCommissionFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Letter of Credit Subfacility [Member] | Subsequent Event [Member] |  |
Subsequent Event [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 / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Letter of credit subfacility, commission fee as a percent of face amount |  | 1.00%fast_LetterOfCreditSubFacilityCommissionFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = us-gaap_LetterOfCreditMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition The commission fee, expressed as a percentage of the amount available to be drawn for letters of credit outstanding under the letter of credit subfacility. + References No definition available. + Details
Name: | fast_LetterOfCreditSubFacilityCommissionFeePercentage
Namespace Prefix: | fast_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |