XML 56 R72.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Income Taxes - Federal Income Tax Treatment of Share Distributions (Parenthetical) (Detail) | Apr. 11, 2013 | Dec. 21, 2012 | Jul. 18, 2013
--- | --- | --- | ---
Series J Preferred Stock |  |  |
Income Tax [Line Items] |  |  |
Depositary shares of preferred stock redeemed | 4,000,000 fr_PreferredStockRedeemedShares / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember | 2,000,000 fr_PreferredStockRedeemedShares / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember |
Depositary Shares | Series J Preferred Stock |  |  |
Income Tax [Line Items] |  |  |
Depositary shares of preferred stock redeemed | 4,000,000 fr_PreferredStockRedeemedShares / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember / us-gaap_StatementEquityComponentsAxis = fr_DepositarySharesMember | 2,000,000 fr_PreferredStockRedeemedShares / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember / us-gaap_StatementEquityComponentsAxis = fr_DepositarySharesMember |
Depositary Shares | Series K Preferred Stock |  |  |
Income Tax [Line Items] |  |  |
Depositary shares of preferred stock redeemed |  |  | 2,000,000 fr_PreferredStockRedeemedShares / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember / us-gaap_StatementEquityComponentsAxis = fr_DepositarySharesMember

X
- Details
Name: | fr_IncomeTaxLineItems
Namespace Prefix: | fr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preferred Stock Redeemed Shares + References No definition available. + Details
Name: | fr_PreferredStockRedeemedShares
Namespace Prefix: | fr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=fr_SeriesJPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=fr_DepositarySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |