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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - SATTi (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]      
Goodwill $ 169,324 $ 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