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Subsequent Event (Details) (Subsequent event, USD $) In Millions, unless otherwise specified | 0 Months Ended
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Feb. 24, 2014 item sqft
Subsequent event |
Subsequent Events |
Area of office building taken on lease | 57,602
Initial term of the lease | 10 years
Number of options available for lease extensions | 2
Period for which lease tem can be extended | 5 years
Annual fixed rent per square foot for the first year of the lease's base term | 42
Threshold amount of annual fixed rent for the first year of the lease's base term | $ 2.4
Incremental annual fixed rent per square foot for remainder of the lease's base term | 1.00
Amount of letters of credit issued as security | 1
Area of office space not included in amendment | 25,099
Amount of base rent payable extension period, if term of the existing lease is extended | $ 2.4

X
- Definition Represents the amount of letters of credit issued as security under the lease. + References No definition available. + Details
Name: | crai_OperatingLeaseAmountOfLetterOfCreditIssuedAsSecurity
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of fixed annual rent on per square foot of real estate property taken on lease. + References No definition available. + Details
Name: | crai_OperatingLeaseAnnualFixedRentPerSquareFoot
Namespace Prefix: | crai_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the threshold amount of annual fixed rent of real estate property taken on lease. + References No definition available. + Details
Name: | crai_OperatingLeaseAnnualFixedRentThresholdAmount
Namespace Prefix: | crai_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the area of real estate property not included in lease amendment. + References No definition available. + Details
Name: | crai_OperatingLeaseAreaOfRealEstatePropertyNotIncludedInLeaseAmendment
Namespace Prefix: | crai_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the incremental amount of fixed annual rent on per square foot of real estate property taken on lease. + References No definition available. + Details
Name: | crai_OperatingLeaseIncrementalAnnualFixedRentPerSquareFoot
Namespace Prefix: | crai_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the initial period of real estate property taken on lease. + References No definition available. + Details
Name: | crai_OperatingLeaseInitialTerm
Namespace Prefix: | crai_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of options available to extend the lease term. + References No definition available. + Details
Name: | crai_OperatingLeaseNumberOfOptionsForLeaseExtension
Namespace Prefix: | crai_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period for which lease term can be extended. + References No definition available. + Details
Name: | crai_OperatingLeasePeriodForWhichLeaseTermCanBeExtended
Namespace Prefix: | crai_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682 + Details
Name: | us-gaap_OperatingLeasesRentExpenseMinimumRentals
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration