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 |