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Income Taxes - Effective Income Tax Rate Differs from Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax provision computed at the federal statutory rate	35.00%	35.00%	35.00%
State income tax provision, net of federal benefit	3.93%	4.86%	2.69%
Federal research credits	(8.15%)	(12.55%)	(4.05%)
Foreign taxes	(0.34%)	2.10%	(7.26%)
Tax-exempt income	(0.53%)	(1.94%)	(1.25%)
State tax incentives	(2.77%)	(5.04%)	(2.21%)
Stock-based compensation	2.53%	6.91%	3.06%
Domestic production activity deduction	(2.23%)	(3.17%)	(1.15%)
Bargain purchase	(2.64%)
Other, net	0.08%	1.30%	0.69%
Effective Tax Rate	24.88%	27.47%	25.52%

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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 deduction for qualified production activity.

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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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