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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Schedule of Rollforward Goodwill (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 01, 2018 | Dec. 01, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 284,804 | $ 355,786 |
Foreign currency adjustments |  |  |  | (2,893) | 4,259 |
Disposal |  |  |  | (261) |  |
Impairment loss | $ 0 | $ 0 | $ (75,200) | 0 | (75,241) | $ 0
Balance at end of period |  |  |  | 281,650 | 284,804 | 355,786
IHT |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | 194,211 | 213,475 |
Foreign currency adjustments |  |  |  | (1,603) | 1,876 |
Disposal |  |  |  | 0 |  |
Impairment loss |  |  |  |  | (21,140) |
Balance at end of period |  |  |  | 192,608 | 194,211 | 213,475
MS |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | 56,600 | 109,059 |
Foreign currency adjustments |  |  |  | (712) | 1,642 |
Disposal |  |  |  | (261) |  |
Impairment loss |  |  |  |  | (54,101) |
Balance at end of period |  |  |  | 55,627 | 56,600 | 109,059
Quest Integrity |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance at beginning of period |  |  |  | 33,993 | 33,252 |
Foreign currency adjustments |  |  |  | (578) | 741 |
Disposal |  |  |  | 0 |  |
Impairment loss |  |  |  |  | 0 |
Balance at end of period |  |  |  | $ 33,415 | $ 33,993 | $ 33,252

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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