Segment and Geographic Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 Hospital
Segment Reporting Information [Line Items]
Number of geographically organized groups	2
Number of owned and operated hospitals	168
Reorganization Group [Member] | National Group [Member]
Segment Reporting Information [Line Items]
Number of owned and operated hospitals	84
Reorganization Group [Member] | American Group [Member]
Segment Reporting Information [Line Items]
Number of owned and operated hospitals	78
Reorganization Group [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Number of owned and operated hospitals	6