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Leases - Supplemental Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Cash Paid for amounts included in measurement of lease liabilities |  |  |  |
Noncash Impairment, Leases | $ 757 | $ 110 | $ 50,979 | $ 4,880

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- Definition Cash Flow, Lessee [Abstract] + References No definition available. + Details
Name: | clvt_CashFlowLesseeAbstract
Namespace Prefix: | clvt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Noncash Impairment, Leases + References No definition available. + Details
Name: | clvt_NoncashImpairmentLeases
Namespace Prefix: | clvt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration