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Summary of Significant Accounting Policies - Amortization of Intangible Assets, Useful Life (Detail)
 12 Months Ended
Dec. 31, 2018
Customer Relationships [Member] | Minimum [Member]  
Finite Lived Intangible Assets [Line Items]  
Amortization of intangible assets, estimated useful life 5 years
Customer Relationships [Member] | Maximum [Member]  
Finite Lived Intangible Assets [Line Items]  
Amortization of intangible assets, estimated useful life 11 years
Research Content [Member] | Minimum [Member]  
Finite Lived Intangible Assets [Line Items]  
Amortization of intangible assets, estimated useful life 1 year
Research Content [Member] | Maximum [Member]  
Finite Lived Intangible Assets [Line Items]  
Amortization of intangible assets, estimated useful life 2 years
Technology [Member] | Minimum [Member]  
Finite Lived Intangible Assets [Line Items]  
Amortization of intangible assets, estimated useful life 5 years
Technology [Member] | Maximum [Member]  
Finite Lived Intangible Assets [Line Items]  
Amortization of intangible assets, estimated useful life 7 years
Trademarks [Member] | Minimum [Member]  
Finite Lived Intangible Assets [Line Items]  
Amortization of intangible assets, estimated useful life 8 years
Trademarks [Member] | Maximum [Member]  
Finite Lived Intangible Assets [Line Items]  
Amortization of intangible assets, estimated useful life 9 years