Summary of Activity Related to Other Intangible Assets, Net (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets [Line Items]
Unamortized Acquired Names	$ 11.1
Amortized Acquired Names	0.1
Estimated amortization expense - 2014	$ 0.2
Acquired Name Of Business [Member]
Goodwill and Intangible Assets [Line Items]
Weighted-average amortization period	3 months 19 days
Noncompete Agreements [Member]
Goodwill and Intangible Assets [Line Items]
Weighted-average amortization period	6 months