Contingencies and Legal Claim Costs - Additional Information (Detail) $ in Millions						3 Months Ended		6 Months Ended
	Jul. 27, 2015 USD ($)	Feb. 09, 2015 USD ($)	Apr. 25, 2014 USD ($)	Jan. 24, 2013 USD ($)	Oct. 28, 2011 Cases	Mar. 31, 2014 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2015 USD ($) Hospital	Jun. 30, 2014 USD ($)	Jul. 31, 2012 Hospital	Oct. 31, 2009 USD ($)
Loss Contingencies [Line Items]
Number of owned and operated hospitals reviewed | Hospital								95
Number of claims filed | Cases					3
Capital commitments in connection with purchase of hospitals											$ 450.0
Additional shortfall related to capital expenditures			$ 78.0
Legal claim costs						$ 78.0	$ 175.0		$ 78.0
Period of agreed capital commitments								5 years
Number of year under court-supervisor accounting for expenditures following the purchase								10 years
Dispute settlement amount		$ 15.0
Health Care Foundation of Greater Kansas City [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Judgment award by the court				$ 162.0
Plaintiff attorneys fees award								$ 12.0
Percentage of legal claim costs						9.00%	9.00%
Florida [Member]
Loss Contingencies [Line Items]
Number of owned and operated hospitals reviewed | Hospital										8
Florida [Member] | Qui Tam Action [Member]
Loss Contingencies [Line Items]
Number of owned and operated hospitals reviewed | Hospital										2
Subsequent Event [Member]
Loss Contingencies [Line Items]
Payments under settlement agreement	$ 15.8