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Segment Information - Segment Revenues and Earnings (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Revenues $ 64,497 $ 47,207 $ 47,992 $ 37,618 $ 105,392 $ 32,185 $ 43,625 $ 37,374 $ 197,314 $ 218,576 $ 238,164
Depreciation, depletion and amortization                 11,447 45,085 41,715
Equity in earnings of unconsolidated ventures 2,251 $ 3,637 $ 188 $ 47 4,470 $ 2,909 $ 5,584 $ 3,045 6,123 16,008 8,685
Income (loss) before taxes from continuing operations                 90,815 8,214 57,042
Total assets 733,208       972,246       733,208 972,246  
Investment in unconsolidated ventures 77,611       82,453       77,611 82,453 65,005
Capital expenditures                 6,138 14,690 37,653
Assets of discontinued operations 14       104,967       14 104,967  
Operating Segments | Real Estate                      
Segment Reporting Information [Line Items]                      
Revenues                 190,273 202,830 213,112
Depreciation, depletion and amortization                 976 7,605 3,741
Equity in earnings of unconsolidated ventures                 5,778 15,582 8,068
Income (loss) before taxes from continuing operations                 121,420 67,678 96,906
Investment in unconsolidated ventures 77,611       82,453       77,611 82,453 65,005
Capital expenditures                 5,783 13,644 28,980
Operating Segments | Oil and Gas                      
Segment Reporting Information [Line Items]                      
Revenues                 5,076 9,094 15,690
Depreciation, depletion and amortization                 145 383 684
Equity in earnings of unconsolidated ventures                 173 275 586
Income (loss) before taxes from continuing operations                 3,327 4,230 9,116
Investment in unconsolidated ventures 0       0       0 0 0
Capital expenditures                 0 59 2,240
Operating Segments | Other Natural Resources                      
Segment Reporting Information [Line Items]                      
Revenues                 1,965 6,652 9,362
Depreciation, depletion and amortization                 352 540 497
Equity in earnings of unconsolidated ventures                 172 151 31
Income (loss) before taxes from continuing operations                 (4,625) (608) 5,499
Investment in unconsolidated ventures 0       0       0 0 0
Capital expenditures                 299 745 5,817
Items Not Allocated To Segments                      
Segment Reporting Information [Line Items]                      
Revenues                 0 0 0
Depreciation, depletion and amortization                 7,772 8,166 8,035
Equity in earnings of unconsolidated ventures                 0 0 0
Income (loss) before taxes from continuing operations [1]                 (29,307) (63,086) (54,479)
Investment in unconsolidated ventures 0       0       0 0 0
Capital expenditures                 56 242 616
Continuing Operations                      
Segment Reporting Information [Line Items]                      
Depreciation, depletion and amortization                 9,245 16,694 $ 12,957
Total assets [2] 733,194       867,279       733,194 867,279  
Continuing Operations | Operating Segments | Real Estate                      
Segment Reporting Information [Line Items]                      
Total assets [2] 403,062       691,238       403,062 691,238  
Continuing Operations | Operating Segments | Oil and Gas                      
Segment Reporting Information [Line Items]                      
Total assets [2] 38,907       39,469       38,907 39,469  
Continuing Operations | Operating Segments | Other Natural Resources                      
Segment Reporting Information [Line Items]                      
Total assets [2] 11,531       19,106       11,531 19,106  
Continuing Operations | Items Not Allocated To Segments                      
Segment Reporting Information [Line Items]                      
Total assets [2] $ 279,694       $ 117,466       $ 279,694 $ 117,466  
[1] Items not allocated to segments consist of: For the Year 2016 2015 2014 (In thousands)General and administrative expense$(18,274) $(24,802) $(21,229)Share-based and long-term incentive compensation expense(4,425) (4,474) (3,417)Gain on sale of assets48,891 — —Interest expense(19,985) (34,066) (30,286)Loss on extinguishment of debt, net(35,864) — —Other corporate non-operating income350 256 453 $(29,307) $(63,086) $(54,479)
[2] Total assets excludes assets of discontinued operations of $14 and $104,967 in 2016 and 2015.