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Intangible Assets - Estimated Annual Amortization Expense (Detail)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
USD ($)
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense $ 79,788
2020 [member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense 15,716
2021 [member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense 12,078
2022 [member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense 7,000
2023 [member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense 5,649
2024 [member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense 4,398
More than 5 years [member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense $ 34,947