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Income Taxes - Summary of Effective Tax Rate for Continuing Operations Differed from U.S. Statutory Federal Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory federal tax rate	21.00%	35.00%	35.00%
State taxes, net of federal benefit	0.30%	(4.00%)	1.10%
Adjustment for final positions on filed returns	(1.10%)	(1.10%)	0.20%
Nondeductible expenses and other, net	1.20%	1.50%	1.80%
Federal and state tax credits	(6.40%)	(7.70%)	(11.60%)
Change in federal tax rate		3.20%
Other, net		(0.10%)
Total	15.00%	26.80%	26.50%

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Effective income tax rate reconciliation state taxes net of federal benefit.

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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 income tax rates.

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

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