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Stockholders' Equity - Summary of Dividends/Distributions (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Class of Stock [Line Items] |  |  |  |  |  |
Total Common Dividend/Distribution | $ 47,263 us-gaap_DividendsCommonStockCash |  | $ 38,862 us-gaap_DividendsCommonStockCash |  |  |
Total Preferred Dividend/Distribution | 1,019 us-gaap_DividendsPreferredStockCash |  | 8,733 us-gaap_DividendsPreferredStockCash |  | 18,947 us-gaap_DividendsPreferredStockCash |
Common Stock/Operating Partnership Units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Total Common Dividend/Distribution | 47,263 us-gaap_DividendsCommonStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 38,862 us-gaap_DividendsCommonStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 0 us-gaap_DividendsCommonStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Series F Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Total Preferred Dividend/Distribution | 566 us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember | [1] | 2,896 us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |  | 2,728 us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesFPreferredStockMember |
Series G Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Total Preferred Dividend/Distribution | 453 us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember | [1] | 1,809 us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |  | 1,809 us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember |
Series J Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Total Preferred Dividend/Distribution |  |  | 2,034 us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember | [1] | 10,785 us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = fr_SeriesJPreferredStockMember | [1]
Series K Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Total Preferred Dividend/Distribution |  |  | $ 1,994 us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember | [1] | $ 3,625 us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = fr_SeriesKPreferredStockMember |
[1] | See the "Preferred Stock" section for the redemptions and discussion of pro-rated dividends for all series of preferred stock occurring during the years ended December 31, 2014, 2013 and 2012.

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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