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Segment Information - Segment Revenues and Earnings (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Total revenues $ 58,840 $ 75,107 $ 226,458 $ 232,657
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent 7,982 8,898 43,847 16,294
Segment Earnings [Member]
        
Segment Reporting Information [Line Items]        
Total revenues 58,840 75,107 226,458 232,657
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent 22,658 22,245 85,410 61,408
Segment Earnings [Member] | Real estate [Member]
        
Segment Reporting Information [Line Items]        
Total revenues 32,445 50,356 153,098 170,264
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent 15,987 13,197 66,859 40,747
Segment Earnings [Member] | Oil And Gas [Member]
        
Segment Reporting Information [Line Items]        
Total revenues 24,145 22,095 66,076 53,430
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent 6,002 8,499 16,331 17,869
Segment Earnings [Member] | Other natural resources [Member]
        
Segment Reporting Information [Line Items]        
Total revenues 2,250 2,656 7,284 8,963
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent 669 549 2,220 2,792
Items not allocated to segments [Member]
        
Segment Reporting Information [Line Items]        
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent (14,676) (13,347) (41,563) (45,114)
Items not allocated to segments [Member] | General and administrative expense [Member]
        
Segment Reporting Information [Line Items]        
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent (5,190) (4,648) (15,924) (14,935)
Items not allocated to segments [Member] | Share-based compensation expense [Member]
        
Segment Reporting Information [Line Items]        
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent (991) (3,492) (4,523) (15,367)
Items not allocated to segments [Member] | Interest expense [Member]
        
Segment Reporting Information [Line Items]        
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent (8,634) (5,231) (21,507) (14,892)
Items not allocated to segments [Member] | Other corporate non-operating income [Member]
        
Segment Reporting Information [Line Items]        
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent $ 139 $ 24 $ 391 $ 80