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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Estimated Fair Value | $ 348,110 | $ 507,749
Equity securities, Amortized Cost | 346,643 |
Equity securities, Unrealized Gains | 1,468 |
Equity securities, Unrealized Losses | (1) |
Equity securities, Estimated Fair Value | 348,110 |
Debt and equity securities, Amortized Cost | 346,643 | 507,465
Debt and equity securities, Unrealized Gains | 1,468 | 335
Debt and equity securities, Unrealized Losses | (1) | (51)
Debt and equity securities, Estimated Fair Value | 348,110 | 507,749
US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Debt securities, Amortized Cost | 185,739 | 228,609
Debt securities, Unrealized Gains | 656 | 7
Debt securities, Unrealized Losses |  | (13)
Debt securities, Estimated Fair Value | 186,395 | 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 | 38,445 | 88,920
Debt securities, Unrealized Gains | 111 | 5
Debt securities, Unrealized Losses |  | (30)
Debt securities, Estimated Fair Value | 38,556 | 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 | 90,142 | 87,785
Debt securities, Unrealized Gains | 567 | 262
Debt securities, Unrealized Losses | (1) | (8)
Debt securities, Estimated Fair Value | 90,708 | 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 | 32,317 | 102,151
Debt securities, Unrealized Gains | 134 | 61
Debt securities, Estimated Fair Value | $ 32,451 | 102,212
Equity securities, Amortized Cost |  | 102,151
Equity securities, Unrealized Gains |  | 61
Equity securities, Estimated Fair Value |  | $ 102,212

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