v3.26.1
Reserves - Disclosure of Long Term Investment Revaluation Reserve (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Disclosure Of Long Term Investment Revaluation Reserve [line items]              
Unrealized gain (loss) on LTIs $ (14,783)   $ 36,575   $ 40,113   $ 60,386
Reallocate reserve to retained earnings upon disposal of LTIs         151,519    
LTI revaluation reserve (net of tax) [member]              
Disclosure Of Long Term Investment Revaluation Reserve [line items]              
Long-term investment revaluation reserve at beginning of period 68,353 $ 144,601 (71,913) $ (95,723) 144,601 $ (35,338) (95,723)
Unrealized gain (loss) on LTIs [1] (14,783) 54,896 36,575 23,810   179,939  
Reallocate reserve to retained earnings upon disposal of LTIs [1]   (131,144)          
Long-term investment revaluation reserve at end of period 53,570 68,353 (35,338) (71,913) 53,570 144,601 (35,338)
Change in Fair Value [Member] | LTI revaluation reserve (net of tax) [member]              
Disclosure Of Long Term Investment Revaluation Reserve [line items]              
Long-term investment revaluation reserve at beginning of period 78,996 167,052 (69,514) (95,675) 167,052 (28,994) (95,675)
Unrealized gain (loss) on LTIs [1] (17,090) 63,463 40,520 26,161   196,046  
Reallocate reserve to retained earnings upon disposal of LTIs [1]   (151,519)          
Long-term investment revaluation reserve at end of period 61,906 78,996 (28,994) (69,514) 61,906 167,052 (28,994)
Deferred Tax Recovery Expense [member] | LTI revaluation reserve (net of tax) [member]              
Disclosure Of Long Term Investment Revaluation Reserve [line items]              
Long-term investment revaluation reserve at beginning of period (10,643) (22,451) (2,399) (48) (22,451) (6,344) (48)
Unrealized gain (loss) on LTIs [1] 2,307 (8,567) (3,945) (2,351)   (16,107)  
Reallocate reserve to retained earnings upon disposal of LTIs [1]   20,375          
Long-term investment revaluation reserve at end of period $ (8,336) $ (10,643) $ (6,344) $ (2,399) $ (8,336) $ (22,451) $ (6,344)
[1] LTIs refers to long-term investments in common shares held.