Subsequent Event (Detail) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
Jul. 12, 2013
Subsequent Event [Member]
Subsequent Event [Line Items]
Litigation settlement	$ 29
Litigation settlement, additional contingent amount	$ 7

Litigation Settlement, Additional Contingent Amount

No definition available.

Name:	im_LitigationSettlementAdditionalContingentAmount
Namespace Prefix:	im_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration