Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Jan. 16, 2015	Jan. 01, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill					$ 62,304
Weighted-average amortization period intangible assets					10 years 3 months 18 days
Amortization of intangible assets			$ 2,635	$ 789	$ 5,244	$ 1,251
SkyWave Mobile Communications Inc. [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill					56,758
Acquired intangible assets		$ 67,214
Insync, Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill					$ 5,546
Acquired intangible assets	$ 5,788
Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period intangible assets					10 years 6 months
Customer Lists [Member] | SkyWave Mobile Communications Inc. [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period intangible assets					10 years
Acquired intangible assets		59,371
Customer Lists [Member] | Insync, Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period intangible assets					14 years
Acquired intangible assets	5,056
Patents and Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period intangible assets					9 years 3 months 18 days
Trade Names and Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period intangible assets					7 years 3 months 18 days
IDP Technology [Member] | SkyWave Mobile Communications Inc. [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period intangible assets					10 years
Acquired intangible assets		6,781
IDP Technology [Member] | Insync, Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period intangible assets					10 years
Acquired intangible assets	632
Trademarks [Member] | SkyWave Mobile Communications Inc. [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period intangible assets					5 years
Acquired intangible assets		$ 1,062
Trademarks [Member] | Insync, Inc [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted-average amortization period intangible assets					4 years
Acquired intangible assets	$ 100