Acquisitions - Summary of Useful Lives of Customer Relationships Based on Customer Attrition (Detail) - USD ($) $ in Thousands		6 Months Ended
	Jun. 09, 2017	Jun. 30, 2017
Business Acquisition [Line Items]
Estimated Useful life (years)		11 years 4 months 24 days
Customer Lists [Member]
Business Acquisition [Line Items]
Estimated Useful life (years)		12 years 1 month 6 days
Inthinc [Member]
Business Acquisition [Line Items]
Total intangible assets	$ 24,300
Inthinc [Member] | Customer Lists [Member]
Business Acquisition [Line Items]
Estimated Useful life (years)	20 years
Total intangible assets	$ 18,500
Inthinc [Member] | Technology [Member]
Business Acquisition [Line Items]
Estimated Useful life (years)	10 years
Total intangible assets	$ 5,800