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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

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