Goodwill and Other Intangible Assets, Net (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2014 USD ($)
Goodwill and Intangible Assets [Line Items]
Other intangibles impairment charge	$ (3.1)
Care Centers Closed Or Consolidated [Member]
Goodwill and Intangible Assets [Line Items]
Other intangibles impairment charge	2.2
Annual Impairment Test Step One [Member]
Goodwill and Intangible Assets [Line Items]
Other intangibles impairment charge	$ 0.9