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Investments in debt and equity securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Investment Holdings [Line Items]    
Debt securities $ 20,426 $ 82,879
Investments in equity securities 38,063 39,143
Equity Securities, FV-NI 38,063 39,143
Total 58,489 122,022
Debt securities, short-term investments 5,419 67,872
Short-term investments 12,484 77,693
Debt securities, long-term investments 15,007 15,007
Long-term investments 46,005 44,329
Certificates of deposit and other time deposits    
Investment Holdings [Line Items]    
Debt securities 20,426 82,879
Investments in equity securities 0 0
Total 20,426 82,879
Investments in mutual funds and common stocks    
Investment Holdings [Line Items]    
Debt securities 0 0
Investments in equity securities 38,063 39,143
Total 38,063 39,143
Short-term Investments    
Investment Holdings [Line Items]    
Investments in equity securities 7,065 9,821
Long-term Investments    
Investment Holdings [Line Items]    
Equity Securities, FV-NI, Noncurrent $ 30,998 $ 29,322