Impairment Charges and Reserves - Impairment Charges on Assets or Investments (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Impairment Charges And Impairment Of Joint Venture Investments [Abstract]
Assets marketed for sale	$ 5,800	$ 8,500	$ 54,300	$ 49,500
Assets included in the spin-off of RVI	14,100	0	14,100	0
Reserve (adjustment) of preferred equity interests	2,201	(15,377)	4,537	60,623
Total impairment charges	22,100	(5,100)	72,900	121,000
Undeveloped Land [Member]
Impairment Charges And Impairment Of Joint Venture Investments [Abstract]
Undeveloped land	$ 0	$ 1,800	$ 0	$ 10,900

Adjustment (reserve) of preferred equity interests.

No definition available.

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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.

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- Definition

Impairment charges and impairment of joint venture investments.

+ References

No definition available.

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- Definition

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.

+ 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
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-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
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-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

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

+ References

+ Details

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