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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