REVENUE RECOGNITION AND VALUATION ACCOUNTS - Schedule of Allowance for Contractual Discounts and Estimated Uncompensated Care as a Percentage of Gross Accounts Receivable (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Revenue Recognition And Valuation Accounts [Abstract]
Allowance for Contractual Discounts	42.00%	38.00%
Allowance for Uncompensated Care	29.00%	33.00%