Contingencies and Legal Claim Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	6 Months Ended		0 Months Ended	3 Months Ended	6 Months Ended
	Oct. 28, 2011 Cases	Dec. 31, 2012	Jun. 30, 2014 Hospital	Dec. 31, 2003	Jan. 24, 2013 Pending Litigation [Member] Health Care Foundation of Greater Kansas City [Member]	Dec. 31, 2012 Pending Litigation [Member] Health Care Foundation of Greater Kansas City [Member]	Jun. 30, 2014 Pending Litigation [Member] Health Care Foundation of Greater Kansas City [Member]	Jul. 31, 2012 Florida [Member] Hospital
Schedule Of Activities Related To Claims Filed [Line Items]
Number of owned and operated hospitals reviewed			95					8
Number of claims filed	3
Capital commitments in connection with purchase of hospitals				$ 450
Legal claim costs		175	78
Judgment award by the court					162
Period of agreed capital commitments			5 years
Number of year under court-supervisor accounting for expenditures following the purchase			10 years
Plaintiff attorneys fees award							$ 12
Percentage of legal claim costs						9.00%