Satellite Network and Other Equipment - Summary of Satellite Network and Other Equipment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 284,427	$ 275,838
Less: accumulated depreciation and amortization	(49,245)	(45,868)
Property, plant and equipment, net	235,182	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	$ 245,135	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	$ 16,389	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	$ 4,139	4,027
Property, plant and equipment, useful life	3 years
Other [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 6,963	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	$ 11,420	$ 147,288