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Basis of Presentation - Summary of Disaggregation of Revenue by Segment and Product and Services (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Disaggregation Of Revenue [Line Items] |  |
Total revenues | $ 438,869 | $ 380,044
Operating Segments [Member] | Satellite Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenues | 153,561 | 152,214
Operating Segments [Member] | Commercial Networks [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenues | 95,066 | 45,248
Operating Segments [Member] | Government Systems [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenues | 190,242 | 182,582
Product [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenues | 218,129 | 166,118
Product [Member] | Operating Segments [Member] | Satellite Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenues |  | 217
Product [Member] | Operating Segments [Member] | Commercial Networks [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenues | 85,133 | 36,483
Product [Member] | Operating Segments [Member] | Government Systems [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenues | 132,996 | 129,418
Service [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenues | 220,740 | 213,926
Service [Member] | Operating Segments [Member] | Satellite Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenues | 153,561 | 151,997
Service [Member] | Operating Segments [Member] | Commercial Networks [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenues | 9,933 | 8,765
Service [Member] | Operating Segments [Member] | Government Systems [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenues | $ 57,246 | $ 53,164

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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