Earnings Per Share - Additional Information (Detail) In Thousands, unless otherwise specified	3 Months Ended
Mar. 30, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Stock-based awards excluded from the computation of Diluted Earnings Per Share	1,708	1,386

Stock-based awards excluded from the computation of diluted earnings per share.

No definition available.

Name:	im_ShareBasedCompensationArrangementByShareBasedPaymentAwardShares
Namespace Prefix:	im_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration