Goodwill (Details)	6 Months Ended
Jun. 30, 2015
Fair value assumptions
Annual average revenue growth rate (percent)	3.00%
Projected growth rates after discrete forecast period (percent)	3.00%
Discrete forecast period (in years)	5 years
Control premium (percent)	30.00%
International
Fair value assumptions
Weighted average cost of capital (percent)	16.00%
Enterprise value/EBITDA multiples, public company method	8
Enterprise value/EBITDA multiples, guideline transaction method	13
Percentage of excess of fair value of goodwill over carrying value (percent)	13.00%
North America
Fair value assumptions
Weighted average cost of capital (percent)	15.00%
Enterprise value/EBITDA multiples, public company method	6
Enterprise value/EBITDA multiples, guideline transaction method	8
Percentage of excess of fair value of goodwill over carrying value (percent)	89.00%

Represents the discrete forecast period of the cash flows used in the income approach fair value model.

No definition available.

Name:	cbr_FairValueInputsDiscreteForecastPeriod
Namespace Prefix:	cbr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of projected growth rates, used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	cbr_FairValueInputsProjectedGrowthRate
Namespace Prefix:	cbr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair Value Inputs, Public Company Method

+ References

No definition available.

+ Details

Name:	cbr_FairValueInputsPublicCompanyMethod
Namespace Prefix:	cbr_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage above fair value that an investor seeking to acquire control of an entity will pay, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsControlPremium
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

+ Details

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Market valuation of entity divided by earnings before interest, taxes, depreciation, and amortization (EBITDA), used as an input to measure fair value.

+ References

+ Details

Name:	us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of assumed long-term growth in revenues, used as an input to measure fair value.

+ References

+ Details

Name:	us-gaap_FairValueInputsLongTermRevenueGrowthRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_GoodwillLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

+ Details

Name:	us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=cbr_InternationalSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_NorthAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: