Acquisitions - Summary of Useful Lives of Customer Relationships Based on Customer Attrition (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	9 years 10 months 24 days
Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	10 years 3 months 18 days
WAM Technologies, LLC [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets	$ 4,810
WAM Technologies, LLC [Member] | Customer Lists One Customer [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	10 years
Total intangible assets	$ 3,720
WAM Technologies, LLC [Member] | Customer Lists All Other Customers [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	11 years
Total intangible assets	$ 600
WAM Technologies, LLC [Member] | Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	10 years
Total intangible assets	$ 450
WAM Technologies, LLC [Member] | Trademarks [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	1 year
Total intangible assets	$ 40
InSync Software, Inc [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets	$ 5,788
InSync Software, Inc [Member] | Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	10 years
Total intangible assets	$ 632
InSync Software, Inc [Member] | Trademarks [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	4 years
Total intangible assets	$ 100
InSync Software, Inc [Member] | Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	14 years
Total intangible assets	$ 5,056
SkyWave Mobile Communications Inc. [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets	$ 67,214
SkyWave Mobile Communications Inc. [Member] | Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	10 years
Total intangible assets	$ 5,463
SkyWave Mobile Communications Inc. [Member] | Trademarks [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	5 years
Total intangible assets	$ 1,062
SkyWave Mobile Communications Inc. [Member] | Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	10 years
Total intangible assets	$ 59,371
SkyWave Mobile Communications Inc. [Member] | M2M and DGS Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	5 years
Total intangible assets	$ 1,318
Euroscan Holding B.V. [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Total intangible assets	$ 17,400
Euroscan Holding B.V. [Member] | Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	10 years
Total intangible assets	$ 2,400
Euroscan Holding B.V. [Member] | Trademarks [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	10 years
Total intangible assets	$ 600
Euroscan Holding B.V. [Member] | Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Estimated Useful life (years)	12 years
Total intangible assets	$ 14,400