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Geographic Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2013
Segments, Geographical Areas [Abstract]
Number of customers that represent 10% or more of the consolidated net sales	0

X

- Definition

The number of customers that represent 10% or more of the consolidated net sales.

+ References

No definition available.

+ Details

Name:	fast_NumberOfCustomers
Namespace Prefix:	fast_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SegmentsGeographicalAreasAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration