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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