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v3.20.4

Nature of Business and Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipment (Detail) | 12 Months Ended
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Dec. 31, 2020
Core systems | Minimum |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life, in years | 3 years
Core systems | Maximum |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life, in years | 40 years
Buildings | Minimum |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life, in years | 12 years
Buildings | Maximum |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life, in years | 58 years
Leasehold improvements | Minimum |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life, in years | 12 years
Leasehold improvements | Maximum |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life, in years | 40 years
Personal Property, including capitalized internal-use software | Minimum |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life, in years | 3 years
Personal Property, including capitalized internal-use software | Maximum |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Estimated useful life, in years | 10 years

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- Definition Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Details
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Data Type: | na
Balance Type: |
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- Details
Name: | srt_RangeAxis=srt_MinimumMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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