Asset Liquidation Investments and Other Investments (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets	$ 3,733	$ 3,435
Noncurrent assets	222	34
Current liabilities	337	14
Noncurrent liabilities	$ 0	$ 0

Sum of the carrying amounts as of the balance sheet date of the company's share of all joint venture assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

No definition available.

Name:	crbn_AssetLiquidationAssetsCurrent
Namespace Prefix:	crbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant