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Indebtedness - Senior Unsecured Notes Repurchases (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Unsecured Senior Notes [Line Items] |
Principal Amount Repurchased | $ 29,824 fr_PrincipalAmountOfSeniorUnsecuredNotesRepurchased
Purchase Price | 33,492 fr_PurchasePriceSeniorUnsecuredNotes
2017 Notes |
Unsecured Senior Notes [Line Items] |
Principal Amount Repurchased | 430 fr_PrincipalAmountOfSeniorUnsecuredNotesRepurchased / us-gaap_DebtInstrumentAxis = fr_SeniorNoteDueTwoThousandSeventeenMember
Purchase Price | 482 fr_PurchasePriceSeniorUnsecuredNotes / us-gaap_DebtInstrumentAxis = fr_SeniorNoteDueTwoThousandSeventeenMember
2017 II Notes |
Unsecured Senior Notes [Line Items] |
Principal Amount Repurchased | 5,000 fr_PrincipalAmountOfSeniorUnsecuredNotesRepurchased / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSeventeenTwoNotesMember
Purchase Price | 5,300 fr_PurchasePriceSeniorUnsecuredNotes / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSeventeenTwoNotesMember
2028 Notes |
Unsecured Senior Notes [Line Items] |
Principal Amount Repurchased | 23,394 fr_PrincipalAmountOfSeniorUnsecuredNotesRepurchased / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandTwentyEightNotesMember
Purchase Price | 26,547 fr_PurchasePriceSeniorUnsecuredNotes / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandTwentyEightNotesMember
2032 Notes |
Unsecured Senior Notes [Line Items] |
Principal Amount Repurchased | 1,000 fr_PrincipalAmountOfSeniorUnsecuredNotesRepurchased / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember
Purchase Price | $ 1,163 fr_PurchasePriceSeniorUnsecuredNotes / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember

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- Definition Principal amount of senior unsecured notes repurchased. + References No definition available. + Details
Name: | fr_PrincipalAmountOfSeniorUnsecuredNotesRepurchased
Namespace Prefix: | fr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Purchase price senior unsecured notes. + References No definition available. + Details
Name: | fr_PurchasePriceSeniorUnsecuredNotes
Namespace Prefix: | fr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
Name: | us-gaap_DebtInstrumentAxis=fr_SeniorNoteDueTwoThousandSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=fr_SeniorNotesDueTwoThousandSeventeenTwoNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=fr_SeniorNotesDueTwoThousandTwentyEightNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |