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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%

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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