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Investments - Available-for-sale Debt Securities in an Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | $ 483,997 | $ 333,557
Less than 12 Months, Unrealized Losses | (2,741) | (3,509)
12 Months or Longer, Fair Value | 241,674 | 372,750
12 Months or Longer, Unrealized Losses | (3,340) | (7,019)
Total, Fair Value | 725,671 | 706,307
Total, Unrealized Losses | (6,081) | (10,528)
U.S treasury bills [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 225,573 | 143,089
Less than 12 Months, Unrealized Losses | (1,528) | (1,860)
12 Months or Longer, Fair Value | 152,818 | 275,445
12 Months or Longer, Unrealized Losses | (1,864) | (4,578)
Total, Fair Value | 378,391 | 418,534
Total, Unrealized Losses | (3,392) | (6,438)
U.S agency securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 258,424 | 190,468
Less than 12 Months, Unrealized Losses | (1,213) | (1,649)
12 Months or Longer, Fair Value | 88,856 | 97,305
12 Months or Longer, Unrealized Losses | (1,476) | (2,441)
Total, Fair Value | 347,280 | 287,773
Total, Unrealized Losses | $ (2,689) | $ (4,090)

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