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Goodwill And Acquired Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended 60 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2011
Jul. 01, 2015
Goodwill and Intangible Assets Disclosure [Line Items]          
Amortization of intangible assets $ 2,103 $ 1,051 $ 0    
Intangible asset impairment losses 0 0 0    
Goodwill impairment 0 0 $ 0    
Goodwill $ 68,656 $ 68,660      
FCI, Centronix and BTL          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill acquired during period       $ 66,300  
Shannon Systems          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill         $ 33,204