Acquisitions - Summary of Purchase Price Allocation of Acquired Assets and Assumed Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Apr. 30, 2021	Mar. 31, 2021
Business Acquisition [Line Items]
Goodwill	$ 191,125		$ 122,300
Euro​ Infrastructure​ Co Step Acquisition [Member]
Business Acquisition [Line Items]
Current assets		$ 154,479
Property, equipment and satellites		109,433
Identifiable intangible assets		26,574
Goodwill		41,157
Other assets		1,004
Total assets acquired		332,647
Total liabilities assumed		(5,296)
Total consideration transferred		327,351
RigNet, Inc [Member]
Business Acquisition [Line Items]
Current assets		88,166
Property, equipment and satellites		63,191
Identifiable intangible assets		221,540
Goodwill		29,132
Other assets		13,350
Total assets acquired		415,379
Current liabilities		(66,006)
Other long-term liabilities		(31,433)
Total liabilities assumed		(97,439)
Total consideration transferred		$ 317,940