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Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Jul. 01, 2015
Business Acquisition [Line Items]      
Goodwill $ 68,656 $ 68,660  
Shannon Systems      
Business Acquisition [Line Items]      
Cash and cash equivalents     $ 1,903
Accounts receivable, net     946
Inventories     2,624
Other current assets     289
Property and equipment     71
Goodwill     33,204
Identifiable intangible assets     8,381
Accounts payable     (644)
Accrued expenses and other current liabilities     (1,209)
Net assets acquired     $ 45,565