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Investments in debt and equity securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Investment Holdings [Line Items]    
Debt securities $ 22,014 $ 22,109
Investments in equity securities 36,326 37,391
Equity Securities, FV-NI 36,326 37,391
Total 58,340 59,500
Debt securities, short-term investments 7,011 7,110
Short-term investments 10,611 11,610
Debt securities, long-term investments 15,003 14,999
Long-term investments 47,729 47,890
Certificates of deposit and other time deposits    
Investment Holdings [Line Items]    
Debt securities 22,014 22,109
Investments in equity securities 0 0
Total 22,014 22,109
Investments in mutual funds and common stocks    
Investment Holdings [Line Items]    
Debt securities 0 0
Investments in equity securities 36,326 37,391
Total 36,326 37,391
Short-term Investments    
Investment Holdings [Line Items]    
Investments in equity securities 3,600 4,500
Long-term Investments    
Investment Holdings [Line Items]    
Equity Securities, FV-NI, Noncurrent $ 32,726 $ 32,891