Organization and Significant Accounting Policies - Schedule of Estimated Useful Life of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2015
Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Vehicles
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Minimum | Messaging devices
Property, Plant and Equipment [Line Items]
Estimated Useful Life	1 year
Minimum | Paging and computer equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life	1 year
Minimum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated Useful Life	3 years
Maximum | Messaging devices
Property, Plant and Equipment [Line Items]
Estimated Useful Life	2 years
Maximum | Paging and computer equipment
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Maximum | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years