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Investment in and Advances to Non-Consolidated Entities (Details) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Jul. 31, 2012 | Dec. 31, 2012 Partnerships | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Lexington Reality Advisors Inc [Member] | Dec. 31, 2011 Lexington Reality Advisors Inc [Member] | Dec. 31, 2010 Lexington Reality Advisors Inc [Member] | Apr. 30, 2011 Pemlex LLC [Member] sqft | Dec. 31, 2012 Pemlex LLC [Member] | Dec. 31, 2012 Net Lease Strategic Assets Fund L P [Member] | Dec. 31, 2011 Net Lease Strategic Assets Fund L P [Member] | Dec. 31, 2010 Net Lease Strategic Assets Fund L P [Member] | Dec. 31, 2012 Net Lease Strategic Assets Fund L P [Member] Common Stock [Member] | Dec. 31, 2012 Net Lease Strategic Assets Fund L P [Member] Common Stock [Member] Inland American Real Estate Trust Inc [Member] | Dec. 31, 2012 Net Lease Strategic Assets Fund L P [Member] Preferred Shares [Member] | Dec. 31, 2012 Lex Win Concord [Member] | Dec. 31, 2011 Lex Win Concord [Member] | Dec. 31, 2012 Concord and CDH CDO [Member] | Dec. 31, 2012 LW Sofi LLC [Member] | Dec. 31, 2011 Other Nonconsolidated Entity [Member] | Dec. 31, 2012 Partnership [Member] Maximum [Member] | Dec. 31, 2012 Partnership [Member] Minimum [Member] | Dec. 31, 2012 Palm Beach Gardens, Florida [Member] Joint Venture [Member] sqft Y | Dec. 31, 2012 Humble Texas [Member] Joint Venture [Member] Y | Dec. 31, 2012 Nonrecourse Mortgage [Member] Joint Venture [Member] | Dec. 31, 2012 Mortgages [Member] | Dec. 31, 2012 Mortgages [Member] Partnership [Member] | Jul. 31, 2012 Financial Standby Letter of Credit [Member]
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of joint ventures formed |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Square feet of property acquired |  |  |  |  |  |  |  | 210,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,000 |  |  |  |  |
Investment in joint venture |  | $ 20,172,000 | $ 19,940,000 | $ 0 |  |  |  | $ 14,180,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,750,000 |  |  |  |  |
Lease term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 | 17 |  |  |  |
Co-venture equity ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  | 100.00% |  |  |  |  |  | 40.00% | 27.00% | 36.00% | 15.00% |  |  |  |
Advances to Affiliate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 |  |  |  |  |
Property Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,750,000 |  |  |  |
Debt interest rate percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.70% |  |  |
Internal rate of return on investment |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual preferred return on investment |  |  |  |  |  |  |  | 9.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from equity method investment |  | 21,531,000 | 30,334,000 | 21,741,000 |  |  |  |  | 1,344,000 | 2,382,000 | 3,599,000 | 3,636,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of interest in consolidated subsidiaries | 13,218,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, contingent letter of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000
Co-venture equity ownership percentage, by partner |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity recognized in income using hypothetical liquidation |  |  |  |  |  |  |  |  |  | 12,902,000 | 21,572,000 | 19,468,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between assets contributed and fair value of initial investment |  |  |  |  |  |  |  |  |  | 94,723,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment distributions |  | 7,498,000 | 11,549,000 | 3,233,000 |  |  |  |  |  |  |  |  |  |  |  | 885,000 | 3,954,000 |  |  |  |  |  |  |  |  |  |  |
Investment sold, carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |
Equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,760,000 | 719,000 |  |  |  |  |  |  |  |
Number of partnerships |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,559,000 |  |  |  |  |  |  |  |
Mortgage debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,260,000 | 11,034,000 | 32,039,000 |
Interest rate range, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.20% |
Interest rate range, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.60% |
Weighted-average interest rate |  | 5.60% | 5.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% |
Advisory fees |  |  |  |  | $ 875,000 | $ 804,000 | $ 967,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The item represents the difference, if any, between the amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and the amount of underlying equity in net assets the reporting Entity has in the investee. A difference can arise between the carrying value of the equity method investment and the value of the Entity's amount of underlying equity in net assets of the investee, for example, from appreciation of certain assets which is not recognized in earnings, but is recognized in other comprehensive income (a separate component of shareholders' equity) by the investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 + Details
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- Definition The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The amount of square footage related to a real estate property. + References No definition available. + Details
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