Acquisitions - Reconciliation of Assets Acquired with Cash Paid at Closing (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Feb. 27, 2015
Business Acquisition [Line Items]
Net assets acquired	$ 21,431
Cash paid at closing	20,500
Nexgen Wireless, Inc. [Member]
Business Acquisition [Line Items]
Net assets acquired	21,431
Due Nexgen - contingent liability	(91)	$ (2,250)
Due Nexgen - working capital adjustment	$ (840)