Summary of Significant Accounting Policies - Summary of Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2015
Satellite Network [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives	1 year
Satellite Network [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives	10 years
Capitalized Software [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives	3 years
Capitalized Software [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives	7 years
Computer Hardware [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives	3 years
Other [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives	2 years
Other [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Estimated useful lives	7 years