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Strategic Partnering Arrangement - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 03, 2017 | Mar. 31, 2017 | Mar. 31, 2016
Business Acquisition [Line Items] |  |  |
Payment related to acquisition of business, net of cash acquired |  | $ 140,378 | $ 1,258
Euro Retail Co [Member] | Eutelsat [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Ownership percentage of issued shares of an entity | 49.00% |  |
Euro Infrastructure Co [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Ownership percentage of issued shares of an entity | 49.00% | 49.00% |
Payments, net of transaction costs, to acquire the issued shares in investment | $ 139,500 |  |
Payment related to acquisition of business, net of cash acquired | 141,900 |  |
Transaction costs | $ 2,400 |  |

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