Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory U.S. federal income tax provision	$ 14,200	$ (214)	$ 17,219
State tax, net of federal benefit	2,497	1,052	2,221
Foreign tax, net of federal benefit	99	88	50
Nondeductible stock compensation	(264)		1,948
Nondeductible restructuring costs	5,350
Permanent items	412	389	800
Tax credits	(1,123)	(548)	(84)
Unrecognized tax benefit	301	174
Change in valuation allowance	(3,647)	95	353
Return to provision	(952)	(351)	(688)
Changes in deferred taxes		(169)	541
Effects of the Tax Cuts and Jobs Acts	(128,429)
Other		(23)	127
Income tax expense	$ (111,556)	$ 493	$ 22,487

Income tax expense benefit after deferred tax assets and liability adjustments.

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Income Tax Rate Reconciliation Change In Valuation Allowance

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Income tax rate reconciliation permanent items.

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Income Tax Rate Reconciliation Return To Provision Amount

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Income Tax Reconciliation Change In Deferred Taxes

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Amount 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 increase (decrease) in the income tax rates.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount 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 nondeductible restructuring charges.

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Amount 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 nondeductible equity-based compensation costs.

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Amount 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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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Amount 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 state and local income tax settlement.

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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