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Segment Information - Segment Revenues and Earnings (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 57,430 | $ 83,013 | $ 105,235 | $ 167,618
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent | (55,251) | 22,873 | (67,768) | 35,865
Segment Earnings [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 57,430 | 83,013 | 105,235 | 167,618
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent | (41,383) | 38,898 | (35,649) | 62,752
Segment Earnings [Member] | Real estate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 39,409 | 55,173 | 72,239 | 120,653
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent | 15,527 | 27,297 | 24,593 | 50,872
Segment Earnings [Member] | Oil And Gas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 16,165 | 24,377 | 29,350 | 41,931
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent | (56,867) | 9,522 | (59,808) | 10,329
Segment Earnings [Member] | Other natural resources [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 1,856 | 3,463 | 3,646 | 5,034
Segment Reporting Information Income (Loss) From Continuing Operations Before Income Taxes Attributable To Parent | (43) | 2,079 | (434) | 1,551
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 | (13,868) | (16,025) | (32,119) | (26,887)
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 | (5,177) | (5,566) | (11,197) | (10,734)
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 | (23) | (3,219) | (3,481) | (3,532)
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 | (8,715) | (7,370) | (17,536) | (12,873)
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 | $ 47 | $ 130 | $ 95 | $ 252

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