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Income Taxes - Significant Components of Deferred Taxes (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred Tax Assets: |  |
Real estate | $ 50,759 | $ 69,594
Employee benefits | 13,185 | 15,752
Net operating loss carryforwards | 2,804 | 13,827
Oil and gas properties | 1,672 | 5,510
AMT credits | 5,900 | 3,620
Income producing properties | 2,055 | 0
Oil and gas percentage depletion carryforwards | 3,478 | 3,616
Accruals not deductible until paid | 552 | 911
Other assets | 0 | 139
Gross deferred tax assets | 80,405 | 112,969
Valuation allowance | (73,405) | (97,068)
Deferred tax asset net of valuation allowance | 7,000 | 15,901
Deferred Tax Liabilities: |  |
Undeveloped land | (1,359) | (7,588)
Convertible debt | (5,035) | (6,516)
Income producing properties | 0 | (2,257)
Timber | (283) | (577)
Gross deferred tax liabilities | 6,677 | 16,938
Deferred tax asset, net | 323 | 0
Deferred tax liabilities, net | $ 0 | $ (1,037)

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