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Impairment Charges and Impairment of Joint Venture Investments - Impairment Charges on Assets or Investments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Impairment Charges And Impairment Of Joint Venture Investments [Abstract]
Assets marketed for sale or asset sold	$ 0	$ 1,100	$ 179,700	$ 3,000
Total continuing operations	0	14,342	279,021	16,671
Sold assets – discontinued operations	0	0	0	8,512
Joint venture investments	0	0	0	9,100
Total impairment charges	0	14,300	279,000	34,300
Undeveloped Land [Member]
Impairment Charges And Impairment Of Joint Venture Investments [Abstract]
Undeveloped land previously held for development	$ 0	$ 13,200	$ 99,300	$ 13,700

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- Definition

Amount of write-down of assets recognized into earnings attributable to assets marketed for sale or assets sold.

+ References

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- Definition

Amount of write-down of assets recognized into earnings for assets that have been sold by the reporting entity included in discontinued operations.

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Impairment charges and impairment of joint venture investments.

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Amount of write-down of assets recognized into earnings included in continuing operations and discontinued operations and the equity method investment other than temporary impairment.

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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



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-SubTopic 10



-Section 45



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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.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



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