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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Additional Information (Detail) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 01, 2018 USD ($) | Dec. 01, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) employee country segment Location customer | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  | 3 |  |  |
Number of locations in which company operates | Location |  |  |  | 200 |  |  |
Number of countries in which company operates | country |  |  |  | 20 |  |  |
Number of employees | employee |  |  |  | 7,200 |  |  |
Goodwill impairment loss | $ 0 | $ 0 | $ 75,200,000 | $ 0 | $ 75,241,000 | $ 0 |
Percentage change in stock price |  |  | 43.00% |  |  |  |
Goodwill |  |  |  | 281,650,000 | 284,804,000 | 355,786,000 |
Accumulated goodwill impairment loss |  |  |  | 75,200,000 | 75,200,000 |  |
Deferred tax assets, gross |  |  |  | 73,717,000 | 59,652,000 |  |
Valuation allowance |  |  |  | 10,549,000 | 6,479,000 |  |
Deferred tax liabilities |  |  |  | 61,622,000 | 66,774,000 |  |
Unrecognized tax benefits |  |  |  | $ 2,221,000 | $ 1,159,000 | $ 858,000 | $ 539,000
US Federal income tax rate |  |  |  | 21.00% | 35.00% | 35.00% |
Adjustments to December 31, 2017 provisional estimates |  |  |  | $ (1,800,000) |  |  |
Workers compensation our self-insured retention |  |  |  | 1,000,000 |  |  |
Automobile liability self-insured retention |  |  |  | 500,000 |  |  |
General liability claims we have an effective self-insured retention |  |  |  | 3,000,000 |  |  |
Medical claims, our self-insured retention |  |  |  | 350,000 |  |  |
Environmental liability claims, our self-insured retention |  |  |  | 1,000,000 |  |  |
Accrued capital expenditures |  |  |  | 1,400,000 | $ 2,600,000 | $ 2,300,000 |
MS |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  | 54,101,000 |  |
Goodwill |  |  |  | 55,627,000 | 56,600,000 | 109,059,000 |
IHT |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  | 21,140,000 |  |
Goodwill |  |  |  | 192,608,000 | 194,211,000 | $ 213,475,000 |
Significant Other Observable Inputs (Level 2) | Convertible debt |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Fair value of convertible senior notes |  |  |  | $ 231,500,000 | $ 231,600,000 |  |
Sales Revenue | Customer Concentration Risk |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of customers that accounted for more than ten percent of revenue | customer |  |  |  | 0 |  |  |

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