Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Acquired Finite Lived Intangible Assets [Line Items]
Additions through acquisitions	$ 1,409	$ 72,528
Weighted-average amortization period for intangible assets	9 years 10 months 24 days
Impairment charge		564
Amortization of intangible assets	$ 12,338	10,636	$ 2,795
Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period for intangible assets	10 years 3 months 18 days
Patents and Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period for intangible assets	9 years 2 months 12 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
Skygistics Ltd. [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Additions through acquisitions	$ 1,409
Skygistics Ltd. [Member] | Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period for intangible assets	13 years
SkyWave Mobile Communications Inc. [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Additions through acquisitions		56,511
SkyWave Mobile Communications Inc. [Member] | Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period for intangible assets	10 years
SkyWave Mobile Communications Inc. [Member] | Trademarks [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period for intangible assets	5 years
SkyWave Mobile Communications Inc. [Member] | Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period for intangible assets	10 years
InSync, Inc [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Additions through acquisitions		5,491
WAM Technologies, LLC [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Additions through acquisitions		10,724
WAM Technologies, LLC [Member] | Trademarks [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period for intangible assets	1 year
WAM Technologies, LLC [Member] | Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average amortization period for intangible assets	10 years
SENS [Member] | Customer Lists [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Fair value of intangible assets		280
SENS [Member] | Trademarks [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Fair value of intangible assets		0
SENS [Member] | Technology [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Fair value of intangible assets		$ 30