Benefit Plan - Additional Information (Detail)	12 Months Ended
Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of participant directed contributions to benefit plans	100.00%
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Participants contribution percentage allowed to invest in Company's common stock	20.00%

Defined Contribution Plan, Percentage of Participants Contribution, to Purchase Common Stock

No definition available.

Name:	crr_DefinedContributionPlanPercentageOfParticipantsContributionToPurchaseCommonStock
Namespace Prefix:	crr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration