Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jun. 09, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite Lived Intangible Assets [Line Items]
Measurement period adjustments		$ (549)
Goodwill			$ 52,645
Weighted-average amortization period for intangible assets		10 years 6 months
Amortization of intangible assets		$ 13,075	11,792	$ 12,338
Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period for intangible assets		10 years 10 months 24 days
Patents and Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period for intangible assets		9 years 3 months 18 days
Trade Names and Trademarks [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period for intangible assets		1 year 2 months 12 days
Blue Tree Systems Limited [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Measurement period adjustments		$ 393
Goodwill			26,435
Inthinc [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Measurement period adjustments		$ 156
Goodwill			$ 26,210
Inthinc [Member] | Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period for intangible assets	15 years