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Schedule of Insurance Programs (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Commitment And Contingencies [Line Items]    
Health insurance $ 9.5 $ 11.1
Workers' compensation 17.3 15.6
Professional liability 4.4 3.4
Estimated insurance liability, Total 31.2 30.1
Less: long-term portion (1.0) (1.6)
Estimated insurance liability, Excluding long-term $ 30.2 $ 28.5