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Operating Segments - Summary of Geographical Segments (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
Disclosure of geographical areas [Line Items]                      
Revenue $ 79,221 $ 56,806 $ 21,052 $ 6,361 $ 104,946 $ 146,889 $ 117,957 $ 141,737 $ 163,440 $ 511,529 $ 486,011
Non-Current Assets* [1] 769,864       792,278       769,864 792,278  
India [Member]                      
Disclosure of geographical areas [Line Items]                      
Revenue                 161,313 490,861 453,912
Non-Current Assets* [1] 764,291       786,770       764,291 786,770  
United States [Member]                      
Disclosure of geographical areas [Line Items]                      
Revenue                 32 536 647
Non-Current Assets* [1] 437       112       437 112  
South East Asia [Member]                      
Disclosure of geographical areas [Line Items]                      
Revenue                 1,375 10,324 20,145
Non-Current Assets* [1] 4,902       4,876       4,902 4,876  
Europe [Member]                      
Disclosure of geographical areas [Line Items]                      
Revenue                   3,998 4,811
All Other Countries [Member]                      
Disclosure of geographical areas [Line Items]                      
Revenue                 720 5,810 $ 6,496
Non-Current Assets* [1] $ 234       $ 520       $ 234 $ 520  
[1] Non-current assets presented above represent property, plant and equipment, intangible assets and goodwill, non-current tax assets, and other non-current assets (excluding financial assets).