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Intangible Assets - Estimated Annual Amortization Expense (Detail)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
USD ($)
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense $ 89,252
2019 [member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense 15,279
2020 [member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense 14,204
2021 [member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense 9,700
2022 [member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense 6,095
2023 [member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense 5,047
More than 5 years [member]  
Disclosure of intangible assets with indefinite useful life [line items]  
Estimated annual amortization expense $ 38,927