General (Details)	3 Months Ended
Mar. 31, 2013 segment Item
Operating results by business segment
Number of subsequent events that require disclosure	0
Number of Business segments	5
Managed Behavioral Healthcare
Operating results by business segment
Number of Business segments	2

Represents the number of subsequent events that occurred during the period and require disclosure.

No definition available.

Name:	mgln_NumberOfSubsequentEventsRequiringDisclosure
Namespace Prefix:	mgln_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration