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Accounting policies - Summary of Estimated Useful Life of Intangible Assets (Detail) | 12 Months Ended
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Dec. 31, 2019
Bottom of range [member] | Brand names [member] |
Disclosure of detailed information about intangible assets [line items] |
Intangible assets, estimated useful life | 10 years
Bottom of range [member] | Customer-related intangibles [member] |
Disclosure of detailed information about intangible assets [line items] |
Intangible assets, estimated useful life | 3 years
Bottom of range [member] | Other proprietary tools [member] |
Disclosure of detailed information about intangible assets [line items] |
Intangible assets, estimated useful life | 3 years
Bottom of range [member] | Other [member] |
Disclosure of detailed information about intangible assets [line items] |
Intangible assets, estimated useful life | 3 years
Top of range [member] | Brand names [member] |
Disclosure of detailed information about intangible assets [line items] |
Intangible assets, estimated useful life | 20 years
Top of range [member] | Customer-related intangibles [member] |
Disclosure of detailed information about intangible assets [line items] |
Intangible assets, estimated useful life | 10 years
Top of range [member] | Other proprietary tools [member] |
Disclosure of detailed information about intangible assets [line items] |
Intangible assets, estimated useful life | 10 years
Top of range [member] | Other [member] |
Disclosure of detailed information about intangible assets [line items] |
Intangible assets, estimated useful life | 5 years

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Intangible assets other than goodwill estimated useful life. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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