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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