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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 9 Months Ended | 0 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Oct. 08, 2013 Subsequent Event [Member]
Schedule of Shareholders' Equity [Line Items] |  |  |
Dividend declared date |  |  | Oct. 08, 2013
Dividend declared per share |  |  | $ 0.25
Dividends payment date |  |  | Nov. 22, 2013
Dividends payable record date |  |  | Oct. 25, 2013
Options vesting and exercisable period, maximum (in years) | 8 years |  |
Options termination period after the end of the relevant vesting period (in months) | 13 months |  |
Total stock-based compensation expense for the Fastenal stock option plan | $ 4,050 | $ 3,450 |
Total unrecognized compensation expense | $ 17,273 |  |
Weighted average period over which total unrecognized compensation expense will be recognized (in years) | 4 years 11 months 1 day |  |

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- Definition Aggregate dividends declared 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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