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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 23, 2016 | Nov. 14, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016 | Jun. 30, 2015
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs |  |  |  |  | $ 4,988 |  |  |
Payment related to acquisition of business, net of cash acquired |  |  |  |  | 16,528 | $ 3,908 |  |
Common stock issued under public offering, net of issuance costs |  |  |  |  | 503,061 |  |  |
Forward loss related to loss contracts |  |  | $ 800 | $ 400 | $ 2,800 | 2,100 |  |
Defense contract audit agency completed cost audits |  |  |  |  | Contract costs on U.S. government contracts are subject to audit and review by the Defense Contracting Management Agency (DCMA), the Defense Contract Audit Agency (DCAA), and other U.S. government agencies, as well as negotiations with U.S. government representatives. The Company’s incurred cost audits by the DCAA have not been concluded for fiscal year 2016. As of December 31, 2016, the DCAA had completed its incurred cost audit for fiscal year 2004 and approved the Company’s incurred cost claims for fiscal years 2005 through 2015 without further audit. Although the Company has recorded contract revenues subsequent to fiscal year 2015 based upon an estimate of costs that the Company believes will be approved upon final audit or review, the Company does not know the outcome of any ongoing or future audits or reviews and adjustments, and if future adjustments exceed the Company’s estimates, its profitability would be adversely affected. |  |  |
Advertising costs |  |  | 1,900 | 3,100 | $ 3,500 | 9,700 |  |
Capitalized interest expense |  |  | 13,400 | $ 7,700 | 35,200 | 20,900 |  |
Total capitalized costs related to patents |  |  | 3,200 |  | 3,200 |  | $ 3,200 |
Total capitalized costs related to orbital slots and other licenses |  |  | 15,400 |  | 15,400 |  | 15,400 |
Accumulated amortization of patents, orbital slots and other licenses |  |  | 2,000 |  | 2,000 |  | 1,700 |
Capitalized debt issuance costs |  |  | 6,100 |  | $ 6,100 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  |  |  |  | 2 years |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  |  |  |  | 24 years |  |  |
Property and Equipment, Net [Member] |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property and equipment |  |  | 1,179,608 |  | $ 1,179,608 |  | 1,050,886 |
Accumulated depreciation and amortization |  |  | 633,933 |  | $ 633,933 |  | 563,976 |
CPE Leased Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  |  |  |  | 4 years |  |  |
CPE Leased Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, equipment and satellites, estimated useful life (years) |  |  |  |  | 5 years |  |  |
CPE Leased Equipment [Member] | Property and Equipment, Net [Member] |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property and equipment |  |  | 268,742 |  | $ 268,742 |  | 260,409 |
Accumulated depreciation and amortization |  |  | 153,400 |  | $ 153,400 |  | 136,400 |
Common Stock [Member] |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs |  |  |  |  | 61,888 |  |  |
Common stock issued under public offering, net of issuance costs | 7,475,000 |  |  |  | 7,475,000 |  |  |
Common stock issued under public offering, net of issuance costs |  |  |  |  | $ 1 |  |  |
Paid-in Capital [Member] |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs |  |  |  |  | 4,988 |  |  |
Common stock issued under public offering, net of issuance costs | $ 503,100 |  |  |  | 503,060 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Payments of revolving credit facility borrowings | $ 225,000 |  |  |  | 270,000 | $ 185,000 |  |
Engreen [Member] |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Purchase price of the acquisition |  |  |  |  |  |  |  | $ 5,300
Arconics [Member] |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Purchase price of acquisition of business |  | $ 21,600 |  |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs |  | $ 5,000 |  |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs |  | 61,888 |  |  |  |  |  |
Cash consideration related to acquisition of business |  | $ 16,600 |  |  |  |  |  |
Cash acquired from acquisition of business |  | 600 |  |  |  |  |  |
Payment related to acquisition of business, net of cash acquired |  | $ 16,000 |  |  |  |  |  |
Unfavorable Regulatory Action [Member] |  |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
U.S. government contract-related reserves |  |  | $ 1,700 |  | $ 1,700 |  | $ 2,500 |

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