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Identified Intangible Assets - Identified Intangible Assets (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Gross Assets $ 162,927 $ 159,977
Accumulated Amortization (96,438) (87,052)
Net 66,489 72,925
Acquired Patents Core Technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Assets 135,107 132,157
Accumulated Amortization (70,572) (62,053)
Net $ 64,535 70,104
Acquired Patents Core Technology | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 3 years  
Acquired Patents Core Technology | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 15 years  
Existing Technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Assets $ 18,920 18,700
Accumulated Amortization (18,530) (17,932)
Net $ 390 768
Existing Technology | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 5 years  
Existing Technology | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 10 years  
Customer Contracts    
Finite-Lived Intangible Assets [Line Items]    
Gross Assets $ 8,600 8,600
Accumulated Amortization (7,047) (6,569)
Net $ 1,553 2,031
Customer Contracts | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 3 years  
Customer Contracts | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 9 years  
Trade Names    
Finite-Lived Intangible Assets [Line Items]    
Gross Assets $ 300 520
Accumulated Amortization (289) (498)
Net $ 11 $ 22
Trade Names | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 4 years  
Trade Names | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 10 years