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Property Dispositions and Real Estate Impairment - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Property | Dec. 31, 2016 USD ($) Property | Dec. 31, 2015 USD ($) Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Proceeds from sale of property | $ 223,853 | $ 370,038 | $ 156,461
Aggregate gain on sale of properties | 63,428 | 81,510 | 24,884
Gain (loss) on debt extinguishment on sale of properties | $ 5,938 | $ (532) | 21,498
Properties classified as held-for-sale (in number of properties) | Property | 1 | 2 |
Other asset impairment charges | $ 39,702 | $ 100,195 | 36,832
LCIF [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Proceeds from sale of property | 17,847 | 238,891 |
Aggregate gain on sale of properties | 4,491 | 36,380 | 0
Impairment charges on real estate | $ 5,259 | 72,072 | $ 787
Number of properties sold | Property |  |  | 0
Gain (loss) on debt extinguishment on sale of properties |  | $ 7,388 |
Properties classified as held-for-sale (in number of properties) | Property | 0 | 0 |
Land [Member] | New York, New York [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairment charges on real estate |  | $ 65,500 |
Number of properties sold | Property |  | 3 |
Land [Member] | New York, New York [Member] | LCIF [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairment charges on real estate |  | $ 65,500 |
Number of properties sold | Property |  | 3 |
Office Building [Member] | LCIF [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Asset impairment charges | $ 6,802 |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: 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=98514028&loc=d3e3602-108585 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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