Acquisitions - Provisional Allocation of Purchase Price for Assets from Date of Acquisition (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition Purchase Price Allocation [Line Items]
Purchase price allocation, Goodwill	$ 3,493	$ 161
Purchase price allocation, Assets and Liabilities Assumed, Net	21,431
Nexgen Wireless, Inc. [Member]
Business Acquisition Purchase Price Allocation [Line Items]
Purchase price allocation, Accounts receivable	5,358
Purchase price allocation, Prepaid and other assets	49
Purchase price allocation, Deferred cost of sales	24
Purchase price allocation, Fixed assets	43
Purchase price allocation, Goodwill	3,332
Purchase price allocation, Total intangible assets	16,498
Purchase price allocation, Assets	21,972
Purchase price allocation, Accounts payable	200
Purchase price allocation, Accrued liabilities	341
Purchase price allocation, Liabilities	541
Purchase price allocation, Assets and Liabilities Assumed, Net	21,431
Nexgen Wireless, Inc. [Member] | Tangible Assets [Member]
Business Acquisition Purchase Price Allocation [Line Items]
Purchase price allocation, Assets	5,474
Nexgen Wireless, Inc. [Member] | Customer Relationships [Member]
Business Acquisition Purchase Price Allocation [Line Items]
Purchase price allocation, Intangible assets	8,117
Nexgen Wireless, Inc. [Member] | Trade Names [Member]
Business Acquisition Purchase Price Allocation [Line Items]
Purchase price allocation, Intangible assets	972
Nexgen Wireless, Inc. [Member] | Technology [Member]
Business Acquisition Purchase Price Allocation [Line Items]
Purchase price allocation, Intangible assets	3,332
Nexgen Wireless, Inc. [Member] | Backlog [Member]
Business Acquisition Purchase Price Allocation [Line Items]
Purchase price allocation, Intangible assets	162
Nexgen Wireless, Inc. [Member] | Non-Compete [Member]
Business Acquisition Purchase Price Allocation [Line Items]
Purchase price allocation, Intangible assets	$ 583