Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired			$ 3,962
Increase (decrease) in cost of intangible assets			10,300
Amortization of intangible assets	$ 1,185	$ 464	1,839	$ 1,038
Restructuring charges	440	$ 0	$ 440	$ 0
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets basis over estimated useful lives			1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets basis over estimated useful lives			8 years
Nexgen Wireless, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired			$ 4,000
Intangible asset	12,500		12,500
Amortization of intangible assets			1,800
Intangible asset amortization expense	$ 700		1,000
Restructuring charges			$ 400