Revenue Recognition and Valuation Accounts - Schedule of Allowance for Contractual Discounts and Estimated Uncompensated Care as a Percentage of Gross Accounts Receivable (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance for Contractual Discounts	45.00%		44.00%
Allowance for Uncompensated Care	26.00%		27.00%
Air Medical [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Gross Air Medical segment accounts receivable	100.00%	100.00%	100.00%