Satellite Network and Other Equipment - Summary of Satellite Network and Other Equipment (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 228,137	$ 212,401
Less: accumulated depreciation and amortization	(38,454)	(31,780)
Property, plant and equipment, net	189,683	180,621
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	$ 105,159	116,444
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	$ 10,008	7,013
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, useful life	3 years
Property, plant and equipment, gross	$ 3,548	2,761
Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,385	4,703
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	$ 102,656	$ 81,099