Description of Business (Details)	12 Months Ended
Dec. 31, 2011 Segment
Description of Business (Textual)
Number of segments	4
Percentage of shares held by company shareholders	100.00%

Percentage of shares held by company shareholders.

No definition available.

Name:	lll_PercentageOfSharesHeldByCompanyShareholders
Namespace Prefix:	lll_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant