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Impairment Charges and Impairment of Joint Venture Investments - Impairment Charges on Consolidated Assets (Detail) (USD $) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Investments Debt And Equity Securities [Abstract] |  |  |  |
Land held for development | $ 0 | $ 6,400,000 | $ 0 | $ 6,400,000
Undeveloped land | 2,600,000 | 19,100,000 | 2,600,000 | 19,100,000
Assets marketed for sale | 31,800,000 | 16,600,000 | 34,900,000 | 16,600,000
Total continuing operations | 34,439,000 | 42,101,000 | 37,525,000 | 42,132,000
Sold assets or assets held for sale | 500,000 | 38,100,000 | 5,100,000 | 55,500,000
Total discontinued operations | 542,000 | 38,126,000 | 5,135,000 | 55,466,000
Joint venture investments | 0 | 0 | 0 | 560,000
Total impairment charges | $ 34,900,000 | $ 80,200,000 | $ 42,600,000 | $ 98,200,000

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- Definition Impairment charges recognized into earnings attributable to assets marketed for sale. + References No definition available. + Details
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- Definition Total impairment charges included in discontinued operations. + References No definition available. + Details
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- Definition Impairment charges including investments. + References No definition available. + Details
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- Definition Impairments sold assets or assets held for sale in discontinued operations. + References No definition available. + Details
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- Definition Impairment charges recognized into earnings attributable to land held for development. + References No definition available. + Details
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- Definition Impairment charges recognized into earnings attributable to undeveloped land. + References No definition available. + Details
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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 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 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=7658923&loc=d3e32787-111569 + Details
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