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Segment Information - Segment Revenues and Operating Profits (Losses) (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |
Product revenues | $ 160,676 | $ 168,348
Income (loss) from operations | 7,778 | 9,414
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Income (loss) from operations | 10,291 | 14,224
Operating Segments [Member] | Satellite Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Product revenues | 6,685 | 6,276
Income (loss) from operations | 30,867 | 17,041
Operating Segments [Member] | Implied License [Member] | Satellite Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Product revenues | 6,600 | 6,200
Income (loss) from operations | $ 6,600 | $ 6,200

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