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Financial Instruments - Schedule of Maintenance Fee Payment to CCKF (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Related Party Transactions [Abstract] |  |  |  |
Maintenance Fee Payments | $ 436 | $ 859 | $ 1,443 | [1]
[1] | During the first quarter of 2020, the Company prepaid maintenance payments for the full year 2020, of which approximately $0.4 million and $0.8 million was recognized as expense for the quarter and year to date ended June 30, 2020, respectively

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- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration