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 |