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Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

No definition available.

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Data Type:	num:perShareItemType
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Period Type:	instant

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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Data Type:	xbrli:monetaryItemType
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The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

The percentage rate used to calculate dividend payments on preferred stock.

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Business acquisition consolidated revenue after acquisition.

No definition available.

Name:	wab_BusinessAcquisitionConsolidatedRevenueAfterAcquisition
Namespace Prefix:	wab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Business Acquisition Conversion Ratio, Acquiree Shares to Acquiror

No definition available.

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Namespace Prefix:	wab_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Business combination number of countries.

No definition available.

Name:	wab_BusinessCombinationNumberOfCountries
Namespace Prefix:	wab_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Business combination number of employees.

No definition available.

Name:	wab_BusinessCombinationNumberOfEmployees
Namespace Prefix:	wab_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Convertible Preferred Stock, Conversion Period

No definition available.

Name:	wab_ConvertiblePreferredStockConversionPeriod
Namespace Prefix:	wab_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Minority interests percentage for delisting of acquiree company.

No definition available.

Name:	wab_MinimumMinorityInterestsPercentageForDelistingOfAcquireeCompany
Namespace Prefix:	wab_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of business acquisition consideration payable in cash.

No definition available.

Name:	wab_PercentageOfBusinessAcquisitionConsiderationPayableInCash
Namespace Prefix:	wab_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Percentage of business acquisition consideration payable in preferred stock.

No definition available.