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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 478,347	$ 507,749
Equity securities, Amortized Cost	476,850
Equity securities, Unrealized Gains	1,994
Equity securities, Unrealized Losses	(497)
Equity securities, Estimated Fair Value	478,347
Debt and equity securities, Amortized Cost	476,850	507,465
Debt and equity securities, Unrealized Gains	1,994	335
Debt and equity securities, Unrealized Losses	(497)	(51)
Debt and equity securities, Estimated Fair Value	478,347	507,749
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	238,541	228,609
Debt securities, Unrealized Gains	1,588	7
Debt securities, Unrealized Losses		(13)
Debt securities, Estimated Fair Value	240,129	228,603
Equity securities, Amortized Cost		228,609
Equity securities, Unrealized Gains		7
Equity securities, Unrealized Losses		(13)
Equity securities, Estimated Fair Value		228,603
US Government Sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	71,030	88,920
Debt securities, Unrealized Gains	292	5
Debt securities, Unrealized Losses		(30)
Debt securities, Estimated Fair Value	71,322	88,895
Equity securities, Amortized Cost		88,920
Equity securities, Unrealized Gains		5
Equity securities, Unrealized Losses		(30)
Equity securities, Estimated Fair Value		88,895
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	112,075	87,785
Debt securities, Unrealized Gains	74	262
Debt securities, Unrealized Losses	(491)	(8)
Debt securities, Estimated Fair Value	111,658	88,039
Equity securities, Amortized Cost		87,785
Equity securities, Unrealized Gains		262
Equity securities, Unrealized Losses		(8)
Equity securities, Estimated Fair Value		88,039
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	55,204	102,151
Debt securities, Unrealized Gains	40	61
Debt securities, Unrealized Losses	(6)
Debt securities, Estimated Fair Value	$ 55,238	102,212
Equity securities, Amortized Cost		102,151
Equity securities, Unrealized Gains		61
Equity securities, Estimated Fair Value		$ 102,212

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