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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.

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