Satellite Network and Other Equipment - Summary of Satellite Network and Other Equipment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 157,656	$ 121,579
Less: accumulated depreciation and amortization	(24,628)	(20,371)
Property, plant and equipment, net	133,028	101,208
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	29,362	24,976
Less: accumulated depreciation and amortization		(14,550)
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	4,563	3,009
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	2,419	1,852
Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,125	1,703
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	$ 118,806	$ 89,658