Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
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Dec. 31, 2018 |
Dec. 31, 2017 |
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| Income Tax Contingency [Line Items] | ||
| Effective corporate income tax rate | 21.00% | 35.00% |
| Deferred tax assets, valuation allowance | $ 5,371 | $ 6,154 |
| Deferred tax assets, operating loss carryforwards, state and local | 6,000 | |
| Deferred tax assets, impairment losses | $ 200 | |
| Valuation allowance | 5,400 | |
| Domestic Tax Authority [Member] | ||
| Income Tax Contingency [Line Items] | ||
| Net operating loss carryforwards for federal income tax purpose | $ 148,100 | |
| Beginning year of expiry for net operating loss carry forwards | 2021 | |
| Ending year of expiry for net operating loss carryforwards | 2038 | |
| State and Local Jurisdiction [Member] | ||
| Income Tax Contingency [Line Items] | ||
| Net operating loss carryforwards for federal income tax purpose | $ 783,800 | |
| Beginning year of expiry for net operating loss carry forwards | 2019 | |
| Ending year of expiry for net operating loss carryforwards | 2038 | |
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- Definition Represents the beginning year of expiry for net operating loss carryforwards. No definition available.
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- Definition Represents the ending year of expiry for net operating loss carryforwards. No definition available.
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from estimated impairment losses. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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