Acquisitions - Summary of Useful Lives of Customer Relationships Based on Customer Attrition (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	5 years
Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	7 years
SENS [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$ 1,270
SENS [Member] | Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	10 years
Total intangible assets	260
SENS [Member] | Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	3 years
Total intangible assets	30
SENS [Member] | Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	7 years
Total intangible assets	980
GlobalTrak [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets	500
GlobalTrak [Member] | Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	10 years
Total intangible assets	380
GlobalTrak [Member] | Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	5 years
Total intangible assets	70
GlobalTrak [Member] | Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	5 years
Total intangible assets	50
MobileNet [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets	3,460
MobileNet [Member] | Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	10 years
Total intangible assets	730
MobileNet [Member] | Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	5 years
Total intangible assets	130
MobileNet [Member] | Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated useful life (in years)	10 years
Total intangible assets	$ 2,600