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Income Tax Benefit (Expense) - Schedule of Reconciliation of Effective Tax Rate (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract]                      
Income tax benefit using the Company's domestic tax rate, percentage                 15.00% 15.00% 14.99%
Effect of tax rates in foreign jurisdictions, percentage                 7.12% 2.84% 13.19%
Non deductible expenses, percentage                 4.74% 9.52% 1.39%
Tax exempt income, percentage                 0.04% 0.09% 0.42%
Impact of change in tax laws, percentage                 3.66% 0.05%  
Utilization of previously unrecognised tax losses, percentage                 0.06% 0.04% 0.02%
Recognition of previously unrecognized tax losses, percentage                 5.80%    
Utilization of previously recognized tax losses, percentage                 0.29% 0.02%  
Current year losses for which no deferred tax asset was recognized, percentage                 14.16% 5.21% 23.03%
Change in unrecognised temporary differences, percentage                 5.51% 3.28% 3.79%
Others, percentage                 0.11% 0.00% 0.02%
Loss for the year $ 3,201 $ (3,496) $ (21,177) $ (34,570) $ (338,611) $ (29,511) $ (36,803) $ (42,592) $ (56,042) $ (447,517) $ (167,883)
Income tax benefit (expense)                 4,507 29 740
Loss before tax $ (967) $ (3,569) $ (21,309) $ (34,704) $ (338,726) $ (29,599) $ (36,597) $ (42,624) (60,549) (447,546) (168,623)
Income tax benefit using the Company's domestic tax rate                 9,081 67,130 25,285
Effect of tax rates in foreign jurisdictions                 4,313 12,702 22,238
Non deductible expenses                 (2,873) (42,601) (2,338)
Tax exempt income                 25 383 709
Impact of change in tax laws                 2,219 227  
Utilization of previously unrecognised tax losses                 37 159 29
Recognition of previously unrecognized tax losses                 3,509    
Utilization of previously recognized tax losses                 173 75  
Current year losses for which no deferred tax asset was recognized                 (8,574) (23,338) (38,830)
Change in unrecognised temporary differences                 (3,335) (14,700) (6,385)
Others                 (68) (8) 32
Total                 $ 4,507 $ 29 $ 740