Summary Of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Accounting Policies [Abstract]
Amount reclassified from deferred revenue to account receivable allowance	$ 7.5

Amount Reclassified From Deferred Revenue To Account Receivable Allowance

No definition available.

Name:	mdrx_AmountReclassifiedFromDeferredRevenueToAccountReceivableAllowance
Namespace Prefix:	mdrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration