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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 |

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