Other Income (Loss) - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014
Schedule Of Equity Method Investments [Line Items]
Aggregate gain on ownership interest	$ 0.3

Aggregate gain loss on sale or distribution of ownership interest.

No definition available.

Name:	icge_AggregateGainLossOnSaleOrDistributionOfOwnershipInterest
Namespace Prefix:	icge_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration