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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Numerator |  |  |  |
Net income attributable to Wabtec shareholders | $ 72,025 | $ 90,485 | $ 145,914 | $ 184,648
Less: dividends declared - common shares and non-vested restricted stock | (9,605) | (7,209) | (19,177) | (14,565)
Undistributed earnings | $ 62,420 | $ 83,276 | $ 126,737 | $ 170,083
Percentage allocated to common shareholders (as a percent) | 99.70% | 99.70% | 99.70% | 99.70%
Undistributed earnings allocated to common shareholders | $ 62,233 | $ 83,026 | $ 126,357 | $ 169,573
Add: dividends declared - common shares | 9,576 | 7,189 | 19,120 | 14,520
Numerator for basic and diluted earnings per common share | $ 71,809 | $ 90,215 | $ 145,477 | $ 184,093
Denominator |  |  |  |
Basic weighted average common shares outstanding (in shares) | 95,641 | 89,846 | 95,370 | 90,832
Assumed conversion of dilutive stock-based compensation plans (in shares) | 643 | 713 | 701 | 796
Denominator for diluted earnings per common share - adjusted weighted average shares and assumed conversion (in shares) | 96,284 | 90,559 | 96,071 | 91,628
Net income attributable to Wabtec shareholders per common share |  |  |  |
Basic (in dollars per share) | $ 0.75 | $ 1.00 | $ 1.52 | $ 2.03
Diluted (in dollars per share) | $ 0.75 | $ 1.00 | $ 1.52 | $ 2.02
Basic weighted-average common shares outstanding and non-vested restricted stock expected to vest (in shares) | 95,917 | 90,101 | 95,666 | 91,111

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- Definition Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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