Medicare and Medicaid Electronic Health Records Incentives Deferred Gain - Medicare Electronic Health Records Incentives - Additional Information (Detail) (Medicare [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2013 Hospital
Medicare [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Number of community hospitals		4
Incentive payments received	$ 5,257
Incentive payments deferred gain		$ 1,136