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Fair Value of Financial Instruments - Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Cost |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | $ 1,190,167 | $ 1,148,320
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | 1,190,599 | 1,148,877
Cash and Overnight Deposits | Cost |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | 607,945 | 623,561
Cash and Overnight Deposits | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | 607,945 | 623,561
Corporate Commercial Paper | Cost |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | 539,906 | 498,185
Corporate Commercial Paper | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | 540,338 | 498,742
Time deposits and money market funds | Cost |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | 42,316 | 26,574
Time deposits and money market funds | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | $ 42,316 | $ 26,574

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