Debt Instrument, Prepayment Penalty

No definition available.

Name:	ccrn_DebtInstrumentPrepaymentPenalty
Namespace Prefix:	ccrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line Of Credit Facility, Periodic Payment, Percentage of Principal

+ References

No definition available.

+ Details

Name:	ccrn_LineOfCreditFacilityPeriodicPaymentPercentageofPrincipal
Namespace Prefix:	ccrn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Sub Facility For Swingline Loans

+ References

No definition available.

+ Details

Name:	ccrn_LineOfCreditFacilitySubFacilityForSwinglineLoans
Namespace Prefix:	ccrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of credit, subfacility for standby letters of credit.

+ References

No definition available.

+ Details

Name:	ccrn_LineOfCreditFacilitySubLimitForLettersOfCredit
Namespace Prefix:	ccrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=ccrn_SecondLienTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorDebtObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ccrn_CreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SubordinatedDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=ccrn_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ccrn_IncrementalTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=ccrn_FirstEightInstallmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=ccrn_RemainingInstallmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ccrn_DebtCovenantTermsAxis=ccrn_CovenantTerm3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - 2016 Senior Credit Facilities (Details) - USD ($)			3 Months Ended	12 Months Ended
	Jul. 05, 2017	Jun. 22, 2016	Jun. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Prepayment penalty		$ 600,000
Loss on early extinguishment of debt				$ 4,969,000	$ 1,568,000	$ 0
Second Lien Term Loan, net
Debt Instrument [Line Items]
Loss on early extinguishment of debt			$ 1,600,000
Senior Debt \| Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity		40,000,000.0
Subordinated Debt \| Second Lien Term Loan, net
Debt Instrument [Line Items]
Loss on early extinguishment of debt			$ 1,600,000
Term Loan, net \| Incremental Term Loan
Debt Instrument [Line Items]
Face amount	$ 40,000,000.0
Term Loan, net \| Incremental Term Loan \| First Eight Installments
Debt Instrument [Line Items]
Periodic payment, percentage of principal	1.875%
Term Loan, net \| Incremental Term Loan \| Remaining Installments
Debt Instrument [Line Items]
Periodic payment, percentage of principal	2.50%
Term Loan, net \| Incremental Term Loan \| Eurodollar
Debt Instrument [Line Items]
Interest margin	2.25%
Term Loan, net \| Incremental Term Loan \| Base Rate Loans
Debt Instrument [Line Items]
Interest margin	1.25%
Revolving Credit Facility \| Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity		100,000,000.0
Sub facility for swingline loans		15,000,000.0
Line of credit, subfacility for standby letters of credit		35,000,000.0
Revolving Credit Facility \| Subordinated Debt \| Second Lien Term Loan, net
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 30,000,000.0
Covenant Term 3 \| Credit Agreement
Debt Instrument [Line Items]
Commitment fee percentage	0.30%			0.30%
Covenant Term 3 \| Credit Agreement \| Eurodollar
Debt Instrument [Line Items]
Interest margin	2.25%			2.25%
Covenant Term 3 \| Credit Agreement \| Base Rate Loans
Debt Instrument [Line Items]
Interest margin	1.25%			1.25%