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Indebtedness - Information Regarding Indebtedness (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |
Mortgage Loans Payable, Net | $ 599,985 us-gaap_SecuredDebt |  | $ 677,890 us-gaap_SecuredDebt |
Senior Unsecured Notes, Net | 364,861 us-gaap_UnsecuredDebt |  | 445,916 us-gaap_UnsecuredDebt |
Unsecured Term Loan | 200,000 us-gaap_OtherLongTermDebt |  | 0 us-gaap_OtherLongTermDebt |
Unsecured Credit Facility | 185,000 us-gaap_LineOfCredit |  | 173,000 us-gaap_LineOfCredit |
2016 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Unsecured Notes, Net | 159,621 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSixteenNotesMember |  | 159,566 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSixteenNotesMember |
Term Loan Interest Rate | 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSixteenNotesMember |  |  |
Effective Interest Rate | 5.91%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSixteenNotesMember |  |  |
Maturity Date | Jan. 15, 2016 |  |  |
2017 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Unsecured Notes, Net | 54,966 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSeventeenNotesMember |  | 54,960 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSeventeenNotesMember |
Term Loan Interest Rate | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSeventeenNotesMember |  |  |
Effective Interest Rate | 7.52%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSeventeenNotesMember |  |  |
Maturity Date | Dec. 01, 2017 |  |  |
2027 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Unsecured Notes, Net | 6,066 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandTwentySevenNotesMember |  | 6,066 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandTwentySevenNotesMember |
Term Loan Interest Rate | 7.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandTwentySevenNotesMember |  |  |
Effective Interest Rate | 7.11%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandTwentySevenNotesMember |  |  |
Maturity Date | May 15, 2027 |  |  |
2028 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Unsecured Notes, Net | 31,884 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandTwentyEightNotesMember |  | 31,883 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandTwentyEightNotesMember |
Term Loan Interest Rate | 7.60%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandTwentyEightNotesMember |  |  |
Effective Interest Rate | 8.13%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandTwentyEightNotesMember |  |  |
Maturity Date | Jul. 15, 2028 |  |  |
2032 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Unsecured Notes, Net | 10,518 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember |  | 10,514 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember |
Term Loan Interest Rate | 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember |  |  |
Effective Interest Rate | 7.87%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandThirtyTwoNotesMember |  |  |
Maturity Date | Apr. 15, 2032 |  |  |
2014 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Unsecured Notes, Net | 0 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandFourteenNotesMember |  | 81,149 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandFourteenNotesMember |
Maturity Date | Jun. 01, 2014 |  |  |
2017 II Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Unsecured Notes, Net | 101,806 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSeventeenTwoNotesMember |  | 101,778 us-gaap_UnsecuredDebt / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSeventeenTwoNotesMember |
Term Loan Interest Rate | 5.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSeventeenTwoNotesMember |  |  |
Effective Interest Rate | 6.37%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = fr_SeniorNotesDueTwoThousandSeventeenTwoNotesMember |  |  |
Maturity Date | May 15, 2017 |  |  |
Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Mortgage Loans Payable, Net | 599,985 us-gaap_SecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  | 677,890 us-gaap_SecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
Unamortized Premiums | (90)us-gaap_DebtInstrumentUnamortizedPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  | (115)us-gaap_DebtInstrumentUnamortizedPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
Mortgage Loans Payable, Gross | 599,895 fr_SecuredDebtGross / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  | 677,775 fr_SecuredDebtGross / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
Interest Rate, Minimum | 4.03%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |
Interest Rate, Maximum | 8.26%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |
Effective Interest Rate, Minimum | 4.03%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |
Effective Interest Rate, Maximum | 8.26%us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |
Maturity Date Range, Start | Feb. 01, 2016 |  |  |
Maturity Date Range, End | Sep. 01, 2022 |  |  |
Senior Unsecured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Unsecured Notes, Net | 364,861 us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  | 445,916 us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Unamortized Discounts | 241 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  | 980 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Senior Unsecured Notes, Gross | 365,102 fr_UnsecuredDebtGross / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  | 446,896 fr_UnsecuredDebtGross / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Unsecured Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Term Loan | 200,000 us-gaap_OtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember | [1] |  |
Term Loan Interest Rate | 1.906%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember | [1] |  |
Effective Interest Rate | 1.906%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember | [1] |  |
Maturity Date | Jan. 29, 2021 | [1] |  |
Unsecured Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Credit Facility | $ 185,000 us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | [2] | $ 173,000 us-gaap_LineOfCredit / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | [2]
Line of Credit Facility Interest Rate | 1.662%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | [2] |  |
Effective Interest Rate | 1.662%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | [2] |  |
Maturity Date | Sep. 29, 2017 | [2] |  |
[1] | We entered into interest rate protection agreements, with an aggregate notional value of $200,000, to effectively convert the variable rate to a fixed rate. See Note 13.
[2] | The maturity date may be extended an additional year at our election, subject to certain restrictions.

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Minimum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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