Goodwill and Identifiable Intangible Assets, Net - Remaining Weighted Average Useful Life of Definite Lived Intangible Assets (Detail)	12 Months Ended
	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Finite lived identifiable intangible assets, remaining weighted average useful lives	10 years 9 months
Customer relationships
Finite Lived Intangible Assets [Line Items]
Finite lived identifiable intangible assets, remaining weighted average useful lives	13 years 3 months
Trademarks and trade names
Finite Lived Intangible Assets [Line Items]
Finite lived identifiable intangible assets, remaining weighted average useful lives	11 years 1 month
Technology
Finite Lived Intangible Assets [Line Items]
Finite lived identifiable intangible assets, remaining weighted average useful lives	6 years 3 months
Contracts
Finite Lived Intangible Assets [Line Items]
Finite lived identifiable intangible assets, remaining weighted average useful lives	8 years 2 months