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Segment Information - Assets Allocated by Segment (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Cash and cash equivalents	$ 367,756,000	$ 321,783,000	$ 381,390,000	$ 265,798,000
Restricted cash	40,000,000	40,017,000
Total Assets	810,859,000	761,912,000
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Total Assets	417,605,000	372,344,000
Real Estate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Assets	389,936,000	386,222,000
Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 3,318,000	$ 3,346,000

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