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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 6 Months Ended | 0 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jul. 09, 2013 Subsequent Event [Member]
Schedule of Shareholders' Equity [Line Items] |  |  |
Dividend declared date |  |  | Jul. 09, 2013
Dividend declared per share |  |  | $ 0.25
Dividends payment date |  |  | Aug. 23, 2013
Dividends payable record date |  |  | Jul. 26, 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 | $ 2,700 | $ 2,100 |
Total unrecognized compensation expense | $ 18,578 |  |
Weighted average period over which total unrecognized compensation expense will be recognized (in years) | 4 years 6 months 18 days |  |

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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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