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Segment Information - Assets Allocated by Segment (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets |  | $ 1,041,216 | $ 1,258,199 |  |
Cash and cash equivalents |  | 92,640 | 170,127 | $ 170,606 | $ 192,307
Deferred tax asset, net |  | 1,118 | 40,624 |  |
Operating Segments [Member] | Real estate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets |  | 713,912 | 654,774 |  |
Operating Segments [Member] | Oil And Gas [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets |  | 191,328 | 342,703 |  |
Operating Segments [Member] | Other natural resources [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets |  | 20,034 | 22,531 |  |
Items not allocated to segments [Member] | Assets not allocated to segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total Assets | [1] | $ 115,942 | $ 238,191 |  |
[1] | Assets not allocated to segments at third quarter-end 2015 principally consist of cash and cash equivalents of $92,640,000 and a net deferred tax asset of $1,118,000. Assets not allocated to segments at year-end 2014 principally consist of cash and cash equivalents of $170,127,000 and a net deferred tax asset of $40,624,000.

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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