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GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION - Condensed Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 233,401 | $ 398,484 | $ 226,191 | $ 425,849
Receivables, net | 1,166,787 | 942,508 |  |
Inventories | 742,634 | 658,510 |  |
Current assets - other | 122,291 | 868,129 |  |
Total current assets | 2,265,113 | 2,867,631 |  |
Property, plant and equipment | 573,972 | 518,376 | 353,193 |
Goodwill | 2,460,103 | 2,078,765 |  |
Investment in subsidiaries | 0 | 0 |  |
Other intangibles, net | 1,204,432 | 1,053,860 |  |
Other noncurrent assets | 76,360 | 62,386 |  |
Total Assets | 6,579,980 | 6,581,018 | 3,229,513 |
Current liabilities | 1,573,330 | 1,446,639 |  |
Inter-company | 0 | 0 |  |
Long-term debt | 1,823,303 | 1,762,967 |  |
Long-term liabilities - other | 354,815 | 394,587 |  |
Total liabilities | 3,751,448 | 3,604,193 |  |
Total Westinghouse Air Brake Technologies Corporation shareholders' equity | 2,808,868 | 2,205,977 |  |
Noncontrolling interest | 19,664 | 770,848 |  |
Total equity | 2,828,532 | 2,976,825 | 1,701,339 | 1,808,974
Total Liabilities and Equity | 6,579,980 | 6,581,018 |  |
Elimination |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Receivables, net | 0 | 0 |  |
Inventories | 0 | 0 |  |
Current assets - other | 0 | 0 |  |
Total current assets | 0 | 0 |  |
Property, plant and equipment | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Investment in subsidiaries | (9,087,596) | (6,713,763) |  |
Other intangibles, net | 0 | 0 |  |
Other noncurrent assets | 0 | 0 |  |
Total Assets | (9,087,596) | (6,713,763) |  |
Current liabilities | 0 | 0 |  |
Inter-company | 0 | 0 |  |
Long-term debt | 0 | 0 |  |
Long-term liabilities - other | 0 | 0 |  |
Total liabilities | 0 | 0 |  |
Total Westinghouse Air Brake Technologies Corporation shareholders' equity | (9,087,596) | (6,713,763) |  |
Noncontrolling interest | 0 | 0 |  |
Total equity | (9,087,596) | (6,713,763) |  |
Total Liabilities and Equity | (9,087,596) | (6,713,763) |  |
Parent |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 933 | 2,522 | 0 | 146,806
Receivables, net | 77,046 | 79,041 |  |
Inventories | 120,937 | 120,042 |  |
Current assets - other | 1,142 | 52,576 |  |
Total current assets | 200,058 | 254,181 |  |
Property, plant and equipment | 52,532 | 49,031 |  |
Goodwill | 25,274 | 25,275 |  |
Investment in subsidiaries | 6,517,205 | 5,388,613 |  |
Other intangibles, net | 30,575 | 31,897 |  |
Other noncurrent assets | 17,414 | 9,592 |  |
Total Assets | 6,843,058 | 5,758,589 |  |
Current liabilities | 196,827 | 194,983 |  |
Inter-company | 2,121,546 | 1,562,399 |  |
Long-term debt | 1,661,771 | 1,761,933 |  |
Long-term liabilities - other | 54,046 | 33,298 |  |
Total liabilities | 4,034,190 | 3,552,613 |  |
Total Westinghouse Air Brake Technologies Corporation shareholders' equity | 2,808,868 | 2,205,976 |  |
Noncontrolling interest | 0 | 0 |  |
Total equity | 2,808,868 | 2,205,976 |  |
Total Liabilities and Equity | 6,843,058 | 5,758,589 |  |
Guarantors |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 4,802 | 9,496 | 13,157 | 13,297
Receivables, net | 237,360 | 202,779 |  |
Inventories | 137,972 | 128,076 |  |
Current assets - other | 4,507 | (17,844) |  |
Total current assets | 384,641 | 322,507 |  |
Property, plant and equipment | 136,382 | 126,661 |  |
Goodwill | 546,527 | 477,472 |  |
Investment in subsidiaries | 2,570,391 | 1,325,150 |  |
Other intangibles, net | 251,347 | 204,512 |  |
Other noncurrent assets | 295 | (1,914) |  |
Total Assets | 3,889,583 | 2,454,388 |  |
Current liabilities | 217,176 | 196,956 |  |
Inter-company | (2,026,634) | (1,848,777) |  |
Long-term debt | 14 | 58 |  |
Long-term liabilities - other | 67,824 | 74,977 |  |
Total liabilities | (1,741,620) | (1,576,786) |  |
Total Westinghouse Air Brake Technologies Corporation shareholders' equity | 5,632,665 | 4,032,250 |  |
Noncontrolling interest | (1,462) | (1,076) |  |
Total equity | 5,631,203 | 4,031,174 |  |
Total Liabilities and Equity | 3,889,583 | 2,454,388 |  |
Non-Guarantors |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 227,666 | 386,466 | $ 213,034 | $ 265,746
Receivables, net | 852,381 | 660,688 |  |
Inventories | 483,725 | 410,392 |  |
Current assets - other | 116,642 | 833,397 |  |
Total current assets | 1,680,414 | 2,290,943 |  |
Property, plant and equipment | 385,058 | 342,684 |  |
Goodwill | 1,888,302 | 1,576,018 |  |
Investment in subsidiaries | 0 | 0 |  |
Other intangibles, net | 922,510 | 817,451 |  |
Other noncurrent assets | 58,651 | 54,708 |  |
Total Assets | 4,934,935 | 5,081,804 |  |
Current liabilities | 1,159,327 | 1,054,700 |  |
Inter-company | (94,912) | 286,378 |  |
Long-term debt | 161,518 | 976 |  |
Long-term liabilities - other | 232,945 | 286,312 |  |
Total liabilities | 1,458,878 | 1,628,366 |  |
Total Westinghouse Air Brake Technologies Corporation shareholders' equity | 3,454,931 | 2,681,514 |  |
Noncontrolling interest | 21,126 | 771,924 |  |
Total equity | 3,476,057 | 3,453,438 |  |
Total Liabilities and Equity | $ 4,934,935 | $ 5,081,804 |  |

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