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Investments in and Advances to Joint Ventures - Condensed Combined Statements of Operations of Unconsolidated Joint Venture Investments (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Equity Method Investments [Line Items]
Company's proportionate share of the impairment charges	$ 10,500,000	$ 4,400,000	$ 6,600,000
Company's share of aggregate impairment charges reclassified to discontinued operations		800,000	4,000,000
Investment basis value for which no income loss recognized	$ 0
Unconsolidated Joint Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Impairment charges reclassified to discontinued operations related to asset sales		$ 11,100,000	$ 49,300,000
Coventry II Fund JV [Member]
Schedule Of Equity Method Investments [Line Items]
Effective Ownership Percentage			20.00%
Loss on property transfer			$ 32,600,000
Investment basis value for which no income loss recognized			$ 0

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The proportionate share of impairment charges reclassified to discontinued operations of its equity method investee.

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The proportionate share of total impairment charges of its equity method investee.

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The impairment charges reclassified to discontinued operations of its equity method investee.

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No income (loss) recorded for those entities accounted for using the equity method in which its investment basis was zero.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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