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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - SAT (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 26, 2014
Dec. 31, 2013
Business Acquisition [Line Items]        
Goodwill $ 232,240 $ 167,547   $ 134,062
SAT Technology, Inc. ("SAT") [Member]        
Business Acquisition [Line Items]        
Current assets     $ 1,679  
Property and equipment     10  
Goodwill     1,733  
Intangible - finite life, net     840  
Intangible - indefinite life     260  
Total assets acquired     4,522  
Current liabilities assumed     (1,847)  
Deferred tax liabilities     (275)  
Net assets acquired     $ 2,400