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v3.20.4

Summary of Current Financial Performance Thresholds and Vesting Rates (Detail) - Restricted Stock Units (RSUs) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Threshold IRR | 6.00% | 6.00% | 6.00%
Target IRR | 8.00% | 8.00% | 8.00%
Maximum IRR | 14.00% | 14.00% | 14.00%
Threshold IRR |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Shares Vesting | 33.30% |  |
Targeted IRR |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Shares Vesting | 66.60% |  |
Maximum IRR |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of Shares Vesting | 100.00% |  |

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- Definition Percentage of IRR, which is the maximum. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of IRR, which is the target. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of IRR, which is the threshold. + References No definition available. + Details
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Namespace Prefix: | cnk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of vesting of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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