Business Acquisitions Business Acquisitions (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent	$ 1,727
Identifiable intangible assets	5,800
Goodwill, Acquired During Period	57,992
DVTEL [Member]
Business Acquisition [Line Items]
Inventory	5,232
Net tangible assets	5,160
Identifiable intangible assets	27,380
Goodwill, Acquired During Period	57,992
Purchase price	$ 97,492