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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [1] | $ 217,410 | $ 219,093 | $ 650,901 | $ 645,236
Non-Destructive Evaluation and Testing Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 100,084 | 98,041 | 304,232 | 287,860
Repair and Maintenance Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 95,616 | 101,032 | 279,029 | 295,862
Heat Treating |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 11,999 | 12,888 | 43,418 | 38,479
Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 9,711 | 7,132 | 24,222 | 23,035
United States and Canada |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 174,118 | 180,000 | 529,061 | 531,103
Other Countries |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 43,292 | 39,093 | 121,840 | 114,133
IHT |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 101,476 | 96,637 | 310,077 | 284,992
IHT | Non-Destructive Evaluation and Testing Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 80,553 | 77,323 | 244,374 | 226,693
IHT | Repair and Maintenance Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 56 | 0 | 344 | 121
IHT | Heat Treating |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 11,928 | 12,667 | 42,650 | 37,583
IHT | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 8,939 | 6,647 | 22,709 | 20,595
IHT | United States and Canada |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 98,812 | 94,414 | 302,871 | 277,947
IHT | Other Countries |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 2,664 | 2,223 | 7,206 | 7,045
MS |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 96,403 | 101,738 | 280,966 | 299,077
MS | Non-Destructive Evaluation and Testing Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 0 | 0 | 0 | 0
MS | Repair and Maintenance Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 95,560 | 101,032 | 278,685 | 295,741
MS | Heat Treating |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 71 | 221 | 768 | 896
MS | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 772 | 485 | 1,513 | 2,440
MS | United States and Canada |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 63,885 | 73,204 | 189,234 | 217,189
MS | Other Countries |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 32,518 | 28,534 | 91,732 | 81,888
Quest Integrity |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 19,531 | 20,718 | 59,858 | 61,167
Quest Integrity | Non-Destructive Evaluation and Testing Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 19,531 | 20,718 | 59,858 | 61,167
Quest Integrity | Repair and Maintenance Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 0 | 0 | 0 | 0
Quest Integrity | Heat Treating |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 0 | 0 | 0 | 0
Quest Integrity | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 0 | 0 | 0 | 0
Quest Integrity | United States and Canada |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 11,421 | 12,382 | 36,956 | 35,967
Quest Integrity | Other Countries |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | $ 8,110 | $ 8,336 | $ 22,902 | $ 25,200
[1] | Revenues attributable to individual countries/geographic areas are based on the country of domicile of the legal entity that performs the work.

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