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