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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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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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