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Stockholders' Equity - Schedule of Dividends Paid Previously or Declared (Details) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Apr. 13, 2015 | Apr. 13, 2015
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |
Dividends paid per share | $ 0.28 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.25 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.25 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.25 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.25 us-gaap_CommonStockDividendsPerShareCashPaid | $ 1.00 us-gaap_CommonStockDividendsPerShareCashPaid |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Dividend declared per share |  |  |  |  |  |  | $ 0.28 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Dividends paid previously or declared, per share |  |  |  |  |  |  |  | $ 0.56 fast_CommonStockDividendsPerShareCashPaidAndOrDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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