Asset Liquidation Investments and Other Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Gross revenues			$ 5,976	$ 3,474
Gross profit			1,445	2,098
Income from continuing operations			1,449	2,195
Net income	$ 222	$ 478	$ 1,449	$ 2,195

The amount of income (loss) from continuing operations before extraordinary items reported by an asset liquidation investment of the entity and attributable to the Company.

No definition available.

Name:	crbn_AssetLiquidationInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
Namespace Prefix:	crbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration