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Marketable Securities Available-For-Sale Marketable Securities (Detail) - Noncurrent Investments - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 246,364	$ 266,750
Gross Unrealized Gains	1,186	313
Gross Unrealized Losses	(174)	(6)
Fair Market Value	247,376	267,057
U.S. Treasury and government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	87,014	88,535
Gross Unrealized Gains	558	68
Gross Unrealized Losses	0	(2)
Fair Market Value	87,572	88,601
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	122,964	129,860
Gross Unrealized Gains	572	196
Gross Unrealized Losses	(110)	(1)
Fair Market Value	123,426	130,055
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	36,386	48,355
Gross Unrealized Gains	56	49
Gross Unrealized Losses	(64)	(3)
Fair Market Value	$ 36,378	$ 48,401

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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