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Fair Value of Financial Instruments - Cash and Cash Equivalents (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Cost    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents $ 1,148,320 $ 1,512,883
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents 1,148,877 1,513,987
Cash and Overnight Deposits | Cost    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents 623,561 601,207
Cash and Overnight Deposits | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents 623,561 601,207
Corporate Commercial Paper | Cost    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents 498,185 854,929
Corporate Commercial Paper | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents 498,742 856,033
Time deposits and money market funds | Cost    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents 26,574 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 $ 26,574 $ 56,747