Income Taxes - Income Tax Rate Reconciliation (Detail)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	0.00%	1.60%	3.20%
Expiration of capital loss carryover	0.00%	(17.60%)	(25.50%)
Change in valuation allowance related to current activity	(30.10%)	9.20%	25.30%
Change in valuation allowance related to change in tax rate	(291.20%)	0.00%	0.00%
Change in tax rate	291.20%	0.00%	0.00%
Permanent items	1.10%	(5.70%)	(7.60%)
Provision to return adjustments and other	(7.90%)	(7.80%)	(0.80%)
Actual income tax rate	(1.90%)	14.70%	29.60%

Effective Income Tax Rate Reconciliation, Expiration of Capital Loss Carryover, Percent

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Percentage of permanent items pertaining to continuing operations.

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Change in Deferred Tax Assets Valuation Allowance, Percent

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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