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Leases - Narrative (Details)	Sep. 30, 2019
Minimum
Lessee, Lease, Description [Line Items]
Discount rate	1.20%
Maximum
Lessee, Lease, Description [Line Items]
Discount rate	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

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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: