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Segment Information - Segment Revenues and Earnings (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Total revenues $ 43,168 $ 58,840 $ 148,403 $ 226,458
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent (99,980) 7,982 (167,748) 43,847
Segment Earnings [Member]        
Segment Reporting Information [Line Items]        
Total revenues 43,168 58,840 148,403 226,458
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent (81,115) 22,658 (116,764) 85,410
Segment Earnings [Member] | Real estate [Member]        
Segment Reporting Information [Line Items]        
Total revenues 27,957 32,445 100,196 153,098
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent 5,154 15,987 29,747 66,859
Segment Earnings [Member] | Oil And Gas [Member]        
Segment Reporting Information [Line Items]        
Total revenues 13,485 24,145 42,835 66,076
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent (86,192) 6,002 (146,000) 16,331
Segment Earnings [Member] | Other natural resources [Member]        
Segment Reporting Information [Line Items]        
Total revenues 1,726 2,250 5,372 7,284
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent (77) 669 (511) 2,220
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 (18,865) (14,676) (50,984) (41,563)
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 (8,343) (5,190) (19,540) (15,924)
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 (2,245) (991) (5,726) (4,523)
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 (8,315) (8,634) (25,851) (21,507)
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 $ 38 $ 139 $ 133 $ 391