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Segment Information - Assets Allocated by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]        
Total Assets $ 1,268,239 $ 1,172,152    
Cash and cash equivalents 170,606 192,307 54,769 10,361
Deferred tax asset, net 30,932 40,398    
Operating Segments [Member] | Real estate [Member]
        
Segment Reporting Information [Line Items]        
Total Assets 664,642 582,802    
Operating Segments [Member] | Oil And Gas [Member]
        
Segment Reporting Information [Line Items]        
Total Assets 355,501 312,553    
Operating Segments [Member] | Other natural resources [Member]
        
Segment Reporting Information [Line Items]        
Total Assets 23,502 23,478    
Items not allocated to segments [Member] | Assets not allocated to segments [Member]
        
Segment Reporting Information [Line Items]        
Total Assets $ 224,594 [1] $ 253,319 [1]    
[1] Assets not allocated to segments at third quarter-end 2014 principally consist of cash and cash equivalents of $170,606,000 and a net deferred tax asset of $30,932,000. Assets not allocated to segments at year-end 2013 principally consist of cash and cash equivalents of $192,307,000 and a net deferred tax asset of $40,398,000.