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Goodwill and Identified Intangible Assets - Summary of Goodwill and Identified Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 85,857 $ 85,175
Accumulated Amortization (64,578) (55,944)
Total future amortization expense $ 21,279 29,231
Developed core technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 2 years 2 months 12 days  
Gross Carrying Amount $ 31,707 31,707
Accumulated Amortization (20,396) (15,216)
Total future amortization expense $ 11,311 16,491
Customer relationships/contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years 2 months 12 days  
Gross Carrying Amount $ 44,819 44,384
Accumulated Amortization (35,205) (32,098)
Total future amortization expense $ 9,614 12,286
Trademarks and tradenames [Member]    
Finite-Lived Intangible Assets [Line Items]    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 2 years 2 months 12 days  
Gross Carrying Amount $ 654 573
Accumulated Amortization (300) (119)
Total future amortization expense 354 454
Maintenance agreements and related relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 5,500 5,500
Accumulated Amortization (5,500) (5,500)
Total future amortization expense 0 0
Order or Production Backlog [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 3,177 3,011
Accumulated Amortization (3,177) (3,011)
Total future amortization expense $ 0 $ 0