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Goodwill and Identifiable Intangible Assets - Weighted-Average Useful Lives of Intangible Assets (Detail)
12 Months Ended
Dec. 31, 2017
Customer relationships  
Acquired Finite-Lived Intangible Assets [Line Items]  
Weighted-average useful lives 10 years
Developed technologies  
Acquired Finite-Lived Intangible Assets [Line Items]  
Weighted-average useful lives 5 years
Trade name and other  
Acquired Finite-Lived Intangible Assets [Line Items]  
Weighted-average useful lives 8 years