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Indebtedness - Senior Unsecured Notes Repurchases (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased | $ 29,824 | $ 106,303
Purchase Price | 33,492 | 110,613
2014 Notes |  |
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased | 0 | 9,000
Purchase Price | 0 | 9,439
2017 Notes |  |
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased | 430 | 4,223
Purchase Price | 482 | 4,632
2017 II Notes |  |
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased | 5,000 | 0
Purchase Price | 5,300 | 0
2028 Notes |  |
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased | 23,394 | 69,680
Purchase Price | 26,547 | 72,541
2032 Notes |  |
Unsecured Senior Notes [Line Items] |  |
Principal Amount Repurchased | 1,000 | 23,400
Purchase Price | $ 1,163 | $ 24,001

X
- 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

X
- 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

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