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Investment in and Advances to Non-Consolidated Entities (Details) (USD $) | 1 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |
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Jul. 31, 2012 | Sep. 30, 2013 sqft | Sep. 30, 2012 | Dec. 31, 2012 Partnerships | Sep. 30, 2013 Joint Venture [Member] | Jun. 30, 2012 Concord and CDH CDO [Member] | Sep. 30, 2013 Concord and CDH CDO [Member] | Aug. 31, 2013 MARYLAND Joint Venture [Member] | Jul. 31, 2013 Long Island City New York [Member] Joint Venture [Member] | Mar. 31, 2013 Palm Beach Garden, FL Office [Member] Joint Venture [Member] | Dec. 31, 2012 Palm Beach Garden, FL Office [Member] Joint Venture [Member] sqft | Sep. 30, 2013 Palm Beach Garden, FL Office [Member] Joint Venture [Member] | Dec. 31, 2012 Humble Texas [Member] Joint Venture [Member] | Dec. 31, 2012 Nonrecourse Mortgage [Member] Humble Texas [Member] Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in joint venture |  | $ 5,000,000 | $ 1,963,000 |  |  |  |  | $ 5,000,000 | $ 8,918,000 |  | $ 29,750,000 |  |  |
Lease Term (Years) |  |  |  |  |  |  |  | 99 years |  |  | 15 years |  | 17 years |
Other than temporary impairment on joint venture |  |  |  |  | 925,000 |  |  |  |  |  |  |  |  |
Equity Method Investment, Number of Joint Venture Formed During Period |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Square Feet |  | 1,442,000 |  |  |  |  |  |  |  |  | 120,000 |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  | 36.00% | 25.00% | 15.00% |
Advances to Affiliate |  |  |  |  |  |  |  |  |  |  | 12,000,000 |  |  |
Distributions Payable to Real Estate Partnerships |  |  |  |  |  |  |  |  |  | 2,557,000 |  |  |  |
Economic Interest in Joint Venture |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Property Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  | 27,750,000 |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,260,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.70%
Proceeds from Divestiture of Interest in Consolidated Subsidiaries | 13,218,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions from joint venture |  |  |  |  |  |  | 885,000 |  |  |  |  |  |  |
Equity Method Investment Sold, Carrying Amount |  |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  |

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- Definition Long-Term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. This does not include advances to clients. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04.2) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 6 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + 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 FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition The cash outflow or inflow increase (decrease) in distribution due to real estate partnership based upon payments and accruals. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + 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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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