EARNINGS PER SHARE - Narrative (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Earnings Per Share [Abstract]
Percent of income allocated to non-vested restricted stock	0.20%	0.30%	0.20%	0.30%

Net Income (Loss) Attributable To Parent, Percent Allocated To Non-Vested Restricted Stock

No definition available.

Name:	wab_NetIncomeLossAttributableToParentPercentAllocatedToNonVestedRestrictedStock
Namespace Prefix:	wab_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration