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v3.19.3.a.u2

LEASES - Narrative (Details) | Dec. 31, 2019
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Minimum |
Operating Leased Assets [Line Items] |
Discount rate (as a percent) | 1.00%
Maximum |
Operating Leased Assets [Line Items] |
Discount rate (as a percent) | 12.30%

X
- 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
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessee, Weighted Average Discount Rate, Percent + References No definition available. + Details
Name: | wab_LesseeWeightedAverageDiscountRatePercent
Namespace Prefix: | wab_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |