Satellite Network and Other Equipment - Summary of Satellite Network and Other Equipment (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 281,222	$ 275,838
Less: accumulated depreciation and amortization	(62,717)	(45,868)
Property, plant and equipment, net	218,505	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	$ 231,741	104,088
Satellite Network [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	1 year
Satellite Network [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Capitalized Software [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 24,706	13,201
Capitalized Software [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Capitalized Software [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Computer Hardware [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 4,568	4,027
Property, plant and equipment, useful life	3 years
Other [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 7,335	6,853
Other [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Other [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Assets under Construction [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 12,491	$ 147,288