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EARNINGS PER SHARE - Narrative (Details) | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Earnings Per Share [Abstract] |  |
Percent of income allocated to non-vested restricted stock | 0.20% | 0.30%

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

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- Definition Net Income (Loss) Attributable To Parent, Percent Allocated To Non-Vested Restricted Stock + References No definition available. + Details
Name: | wab_NetIncomeLossAttributableToParentPercentAllocatedToNonVestedRestrictedStock
Namespace Prefix: | wab_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration