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Fair Value of Financial Instruments - Cash and Cash Equivalents (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Cost |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | $ 1,293,173 | $ 1,512,883
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | 1,293,788 | 1,513,987
Cash and Overnight Deposits | Cost |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | 679,063 | 601,207
Cash and Overnight Deposits | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | 679,063 | 601,207
Corporate Commercial Paper | Cost |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | 542,625 | 854,929
Corporate Commercial Paper | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | 543,240 | 856,033
Time deposits and money market funds | Cost |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | 71,485 | 56,747
Time deposits and money market funds | Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total cash and cash equivalents | $ 71,485 | $ 56,747

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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