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Earnings Per Share (EPS) - Additional Information (Detail)	Sep. 30, 2012	Sep. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Unvested Restricted Stock Awards Outstanding	745,712	688,708

X

- Definition

Number of unvested restricted stock awards outstanding included in participating securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	fr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

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