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Summary of Gross Carrying Amount and Accumulated Amortization for Intangible Assets Resulting from Acquisitions (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Acquired Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 25,596 $ 23,939
Accumulated amortization (13,599) (12,959)
Intangible assets, net $ 11,997 10,980
Trademarks    
Acquired Finite Lived Intangible Assets [Line Items]    
Amortization period (in years) 5 years  
Gross carrying amount $ 758 600
Accumulated amortization (114) (77)
Intangible assets, net 644 523
Developed Technology    
Acquired Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 9,093 8,300
Accumulated amortization (4,201) (3,978)
Intangible assets, net $ 4,892 4,322
Developed Technology | Minimum    
Acquired Finite Lived Intangible Assets [Line Items]    
Amortization period (in years) 10 years  
Developed Technology | Maximum    
Acquired Finite Lived Intangible Assets [Line Items]    
Amortization period (in years) 12 years  
Customer Relationships    
Acquired Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 15,745 15,039
Accumulated amortization (9,284) (8,904)
Intangible assets, net $ 6,461 $ 6,135
Customer Relationships | Minimum    
Acquired Finite Lived Intangible Assets [Line Items]    
Amortization period (in years) 4 years  
Customer Relationships | Maximum    
Acquired Finite Lived Intangible Assets [Line Items]    
Amortization period (in years) 12 years