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Client Funds - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Custodial |  |
Funds Heldfor Clients [Line Items] |  |
Funds held for clients | $ 537,531,000 | $ 410,673,000

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- Definition [Line Items] for Funds Held for Clients [Table] + References No definition available. + Details
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Namespace Prefix: | crda_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of the funds held on behalf of others and that are expected to be liquidated within one year or the normal operating cycle, if longer. This does not include funds held under reinsurance agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_FundsHeldForClients
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_AwardTypeAxis=crda_CustodialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |