Satellite Network and Other Equipment - Summary of Satellite Network and Other Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 286,434	$ 275,838
Less: accumulated depreciation and amortization	(70,593)	(45,868)
Property, plant and equipment, net	215,841	229,970
Land [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	381	381
Satellite Network [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	231,782	104,088
Capitalized Software [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	30,758	13,201
Computer Hardware [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	4,707	4,027
Other [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	7,522	6,853
Assets under Construction [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 11,284	$ 147,288