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Stockholders' Equity - Additional Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Apr. 10, 2014 Subsequent Event [Member]
Schedule of Shareholders' Equity [Line Items] |  |  |
Dividend declared date |  |  | Apr. 10, 2014
Dividend declared per share |  |  | $ 0.25
Dividends payment date |  |  | May 23, 2014
Dividends payable record date |  |  | Apr. 25, 2014
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 | $ 1,380 | $ 1,350 |
Total unrecognized stock-based compensation expense | $ 14,709 |  |
Weighted average period over which total unrecognized stock-based compensation expense will be recognized (in years) | 4 years 0 months 21 days |  |

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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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