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Stockholders' Equity - Additional Information (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jan. 14, 2014
Subsequent Event [Member]
Schedule of Shareholder's Equity [Line Items]        
Dividend declared date       Jan. 14, 2014
Dividend declared per share       $ 0.25
Dividends payment date       Feb. 28, 2014
Dividends payable record date       Jan. 31, 2014
Dividends paid per share $ 0.80 $ 1.24 $ 0.65  
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 intrinsic value of stock options exercised $ 9,925 $ 34,424 $ 4,977  
Total unrecognized stock-based compensation expense 15,976      
Weighted average period over which total unrecognized stock-based compensation expense will be recognized (in years) 4 years 2 months 15 days      
Total grant date fair value of options vested 3,508 3,866 9,168  
Total stock-based compensation expense for the Fastenal option plan $ 5,400 $ 4,800 $ 4,050