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Fair Value of Financial Instruments - Cash and Cash Equivalents (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Cost    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents $ 1,639,428 $ 2,034,131
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents 1,640,568 2,034,569
Cash and Overnight Deposits | Cost    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents 669,854 1,038,903
Cash and Overnight Deposits | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents 669,854 1,038,903
Corporate Commercial Paper | Cost    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents 906,505 977,887
Corporate Commercial Paper | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents 907,645 978,325
Time deposits and money market funds | Cost    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents 63,069 17,341
Time deposits and money market funds | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash and cash equivalents $ 63,069 $ 17,341