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Stockholders' Equity - Additional Information (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 14, 2015
Schedule of Shareholder's Equity [Line Items] |  |  |  |  |
Dividends paid per share |  | $ 1.00 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.80 us-gaap_CommonStockDividendsPerShareCashPaid | $ 1.24 us-gaap_CommonStockDividendsPerShareCashPaid |
Dividend paid per share, supplemental | $ 0.50 fast_CommonStockSupplementalDividendPerShareCashPaid |  |  |  |
Options vesting and exercisable period, maximum |  | 8 years |  |  |
Total intrinsic value of stock options exercised |  | $ 7,466 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 9,925 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 34,424 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |
Total unrecognized stock-based compensation expense |  | 15,908 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |
Weighted average period over which total unrecognized stock-based compensation expense will be recognized |  | 4 years 7 months 6 days |  |  |
Total grant date fair value of options vested |  | 7,287 fast_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedFairValue | 3,508 fast_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedFairValue | 3,866 fast_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedFairValue |
Total stock-based compensation expense for the Fastenal stock option plan |  | $ 7,039 us-gaap_ShareBasedCompensation | $ 5,400 us-gaap_ShareBasedCompensation | $ 4,800 us-gaap_ShareBasedCompensation |
Options termination period |  | 9 years |  |  |
Subsequent Event [Member] |  |  |  |  |
Schedule of Shareholder's Equity [Line Items] |  |  |  |  |
Dividend declared date |  |  |  |  | Jan. 14, 2015
Dividend declared per share |  |  |  |  | $ 0.28 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Dividends payment date |  |  |  |  | Feb. 27, 2015
Dividends payable record date |  |  |  |  | Jan. 30, 2015
Common stock purchase authorization date |  |  |  |  | Jan. 14, 2015
Common stock purchase authorized shares |  |  |  |  | 2,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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