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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Balance beginning of period at Dec. 31, 2014 | $ 1,808,974 | $ 1,323 | $ 448,531 | $ (392,262) | $ 1,909,136 | $ (159,486) | $ 1,732
Beginning Balance (in shares) at Dec. 31, 2014 |  | 132,349,534 |  | 36,075,139 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cash dividends ($ 0.28 in 2015, $0.36 in 2016 and $0.44 in 2017) | (26,963) |  |  |  | (26,963) |  |
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax | 2,007 |  | (2,918) | $ 4,925 |  |  |
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax, shares (in shares) |  |  |  | 450,738 |  |  |
Stock based compensation | 23,713 |  | 23,713 |  |  |  |
Net income | 398,628 |  |  |  | 398,628 |  |
Translation adjustment | (132,899) |  |  |  |  | (132,899) |
Unrealized gain (loss) on foreign exchange contracts, net of tax ($14 in 2015, $45 in 2016 and $$1,763 in 2017) | (66) |  |  |  |  | (66) |
Unrealized gain (loss) on interest rate swap contracts, net of tax ($444 in 2015, $230 in 2016, and $1,079 in 2017) | (678) |  |  |  |  | (678) |
Change in pension and post-retirement benefit plans, net of tax ($10,279 in 2015, $2,790 in 2016, and $1,300 in 2017) | 16,410 |  |  |  |  | 16,410 |
Stock repurchase, shares (in shares) |  |  |  | (4,889,027) |  |  |
Stock repurchase, value | (387,787) |  |  | $ (387,787) |  |  |
Balance end of period at Dec. 31, 2015 | 1,701,339 | $ 1,323 | 469,326 | $ (775,124) | 2,280,801 | (276,719) | 1,732
Ending Balance (in shares) at Dec. 31, 2015 |  | 132,349,534 |  | 40,513,428 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cash dividends ($ 0.28 in 2015, $0.36 in 2016 and $0.44 in 2017) | (32,430) |  |  |  | (32,430) |  |
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax | (3,452) |  | (8,490) | $ 5,038 |  |  |
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax, shares (in shares) |  |  |  | 328,245 |  |  |
Stock based compensation | 17,748 |  | 17,748 |  |  |  |
Acquisition of Faiveley Transport noncontrolling interest | 760,599 |  |  |  |  |  | 760,599
Net income | 313,404 |  |  |  | 304,887 |  | 8,517
Translation adjustment | (93,684) |  |  |  |  | (93,684) |
Unrealized gain (loss) on foreign exchange contracts, net of tax ($14 in 2015, $45 in 2016 and $$1,763 in 2017) | (324) |  |  |  |  | (324) |
Unrealized gain (loss) on interest rate swap contracts, net of tax ($444 in 2015, $230 in 2016, and $1,079 in 2017) | 354 |  |  |  |  | 354 |
Change in pension and post-retirement benefit plans, net of tax ($10,279 in 2015, $2,790 in 2016, and $1,300 in 2017) | (9,232) |  |  |  |  | (9,232) |
Stock issued for Faiveley Transport Acquisition | 534,679 |  | 391,367 | $ 143,312 |  |  |
Stock issued for Faiveley Transport Acquisition (in shares) |  |  |  | 6,307,489 |  |  |
Stock repurchase, shares (in shares) |  |  |  | (3,046,408) |  |  |
Stock repurchase, value | (212,176) |  |  | $ (212,176) |  |  |
Balance end of period at Dec. 31, 2016 | 2,976,825 | $ 1,323 | 869,951 | $ (838,950) | 2,553,258 | (379,605) | 770,848
Ending Balance (in shares) at Dec. 31, 2016 |  | 132,349,534 |  | 36,924,102 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cash dividends ($ 0.28 in 2015, $0.36 in 2016 and $0.44 in 2017) | (42,218) |  |  |  | (42,218) |  |
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax | (2,416) |  | (7,361) | $ 4,945 |  |  |
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax, shares (in shares) |  |  |  | 608,920 |  |  |
Stock based compensation | 16,650 |  | 16,650 | $ 0 |  |  |
Acquisition of Faiveley Transport noncontrolling interest | (742,282) |  | 8,931 |  |  |  | (751,213)
Net income | 262,290 |  |  |  | 262,261 |  | 29
Translation adjustment | 326,095 |  |  |  |  | 326,095 |
Unrealized gain (loss) on foreign exchange contracts, net of tax ($14 in 2015, $45 in 2016 and $$1,763 in 2017) | 2,282 |  |  |  |  | 2,282 |
Unrealized gain (loss) on interest rate swap contracts, net of tax ($444 in 2015, $230 in 2016, and $1,079 in 2017) | 4,689 |  |  |  |  | 4,689 |
Change in pension and post-retirement benefit plans, net of tax ($10,279 in 2015, $2,790 in 2016, and $1,300 in 2017) | 1,546 |  |  |  |  | 1,546 |
Stock issued for Faiveley Transport Acquisition | 25,071 |  | 18,445 | 6,626 |  |  |
Balance end of period at Dec. 31, 2017 | $ 2,828,532 | $ 1,323 | $ 906,616 | $ (827,379) | $ 2,773,301 | $ (44,993) | $ 19,664
Ending Balance (in shares) at Dec. 31, 2017 |  | 132,349,534 |  | 36,315,182 |  |  |

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Period Type: | instant

X
- Definition Stock awards granted, exercised and cancelled for the following forms of stock compensation 1) Stock Options 2) Restricted Stock Awards and 3) Incentive Stock Awards. + References No definition available. + Details
Name: | wab_StockGrantedExercisedAndCancelledForVariousEquityInstruments
Namespace Prefix: | wab_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration