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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accounting Policies [Abstract] |  |  |
Maturity of liquid investments | three months or less |  |
Accumulated amortization deferred financing costs | $ 17,173 us-gaap_AccumulatedAmortizationDeferredFinanceCosts | $ 17,122 us-gaap_AccumulatedAmortizationDeferredFinanceCosts |
Allowance for doubtful accounts receivable | 1,695 us-gaap_AllowanceForDoubtfulAccountsReceivable | 1,362 us-gaap_AllowanceForDoubtfulAccountsReceivable |
Deferred rent receivable allowance amount | 1,888 fr_DeferredRentReceivableAllowanceAmount | 1,694 fr_DeferredRentReceivableAllowanceAmount |
Minimum percentage of taxable income to be distributed | 90.00%fr_MinimumPercentageOfTaxableIncomeToBeDistributed |  |
In-Place Leases and Tenant Relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense of deferred leasing intangibles | 6,239 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fr_InPlaceLeasesandTenantRelationshipsMember | 5,598 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fr_InPlaceLeasesandTenantRelationshipsMember | 6,768 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fr_InPlaceLeasesandTenantRelationshipsMember
Above and Below Market Leases |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense of deferred leasing intangibles | $ 925 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fr_AboveAndBelowMarketLeasesMember | $ 572 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fr_AboveAndBelowMarketLeasesMember | $ 790 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = fr_AboveAndBelowMarketLeasesMember

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- Definition The minimum stockholder distribution requirement in order to maintain REIT status. + References No definition available. + Details
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- Definition For an unclassified balance sheet, the accumulated amortization, as of the reporting date, representing the periodic charge to earnings of deferred costs which are associated with debt obligations existing as of the end of the period. + 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 210.5-02.17) -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 17 -Article 5 + Details
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- Definition An element designated to encapsulate any additional information related to cash and cash equivalents not otherwise addressed by the existing taxonomy. Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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