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Impairment Charges and Reserves - Impairment Charges on Assets or Investments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Impairment Charges And Impairment Of Joint Venture Investments [Abstract] |  |  |  |
Assets marketed for sale | $ 18,100 | $ 19,000 | $ 48,500 | $ 41,000
(Adjustment) reserve of preferred equity interests | (1,625) | 0 | 2,336 | 76,000
Total impairment charges | 16,500 | 28,100 | 50,800 | 126,100
Undeveloped Land [Member] |  |  |  |
Impairment Charges And Impairment Of Joint Venture Investments [Abstract] |  |  |  |
Undeveloped land | $ 0 | $ 9,100 | $ 0 | $ 9,100

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- Definition Amount of write-down of assets recognized into earnings attributable to assets marketed for sale or assets sold. + References No definition available. + Details
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- Definition Impairment charges and impairment of joint venture investments. + References No definition available. + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 220 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114873921&loc=SL114875236-224282 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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