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Basis of Presentation - Canada Emergency Wage Subsidy Program of 2020 - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021 USD ($)
Canada Emergency Wage Subsidy Program of 2020
Recognition of reduction in compensation expense	$ 1,877,000

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- Definition

Recognition of reduction in compensation expense

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No definition available.

+ Details

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Namespace Prefix:	crda_
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Balance Type:	credit
Period Type:	duration

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- Details

Name:	us-gaap_UnusualRiskOrUncertaintyByNatureAxis=crda_CanadaEmergencyWageSubsidyProgramOf2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: