Goodwill and Intangible Assets - Estimated Useful lives of the Acquired Identifiable Intangible Assets (Detail)	12 Months Ended
	Dec. 31, 2014
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	1 year 6 months
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	7 years 6 months
Non-compete Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	4 years
Non-compete Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	4 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	7 years 6 months
Asset Purchase Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	1 year 6 months
Trade Name and Trademark [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Capitalized Product Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	3 years