v2.4.0.8

Summary of Significant Accounting Policies - Depreciation of Property and Equipment Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2013
Office equipment, furniture, and fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	3 years
Office equipment, furniture, and fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	7 years
Leasehold improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	3 years
Leasehold improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	13 years
Airborne equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	7 years
Network equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	5 years
Network equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciation of property and equipment estimated useful lives	25 years

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration