Segment and Geographic Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014 Hospital
Segment Reporting Information [Line Items]
Number of geographically organized groups	2
Number of owned and operated hospitals	165
National Group [Member]
Segment Reporting Information [Line Items]
Number of owned and operated hospitals	81
American Group [Member]
Segment Reporting Information [Line Items]
Number of owned and operated hospitals	77
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Number of owned and operated hospitals	7