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Stockholders' Equity - Additional Information (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 6 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jul. 10, 2014
Subsequent Event [Member]
Schedule of Shareholders' Equity [Line Items]      
Dividend declared date     Jul. 10, 2014
Dividend declared per share     $ 0.25
Dividends payment date     Aug. 22, 2014
Dividends payable record date     Jul. 25, 2014
Options vesting and exercisable period, maximum 8 years    
Options termination period 9 years    
Total stock-based compensation expense for the Fastenal stock option plan $ 3,000 $ 2,700  
Total unrecognized stock-based compensation expense $ 20,024    
Weighted average period over which total unrecognized stock-based compensation expense will be recognized 4 years 9 months 3 days