Acquisition - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
	May 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Issuance of common stock in connection with acquisition				$ 2,123,455
Total revenues		$ 1,128,539	$ 651,444	3,133,745	$ 1,890,059
Net Income (Loss)		(124,399)	(42,228)	(968,641)	(112,032)
Operating Expense [Member]
Business Acquisition [Line Items]
Severance costs		45,000		45,000
Inmarsat Holdings [Member]
Business Acquisition [Line Items]
The consideration transferred	$ 2,700,000
Payments to acquire business	550,700
Issuance of common stock in connection with acquisition	$ 2,100,000
Shares issued in connection with acquisition of business, net of issuance costs, shares	46,360
Unfavorable contract liabilities included in current liabilities		29,600		29,600
Unfavorable contract liabilities included in other long term liabilities		248,300		$ 248,300
Unfavorable contract liabilities weighted average estimated useful life				9 years
Total revenues		443,100		$ 1,000,000
Net Income (Loss)		$ (24,200)		(159,300)
Inmarsat Holdings [Member] | Selling General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Acquisition-related transaction costs			$ 9,700	$ 30,800	$ 32,000
Satellite Services [Member] | Inmarsat Holdings [Member]
Business Acquisition [Line Items]
Preliminary estimated goodwill	$ 969,200
Government Systems [Member] | Inmarsat Holdings [Member]
Business Acquisition [Line Items]
Preliminary estimated goodwill	$ 484,600