SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Additional Information (Detail)			3 Months Ended	12 Months Ended
	Dec. 01, 2019 USD ($)	Dec. 01, 2018 USD ($)	Sep. 30, 2017	Dec. 31, 2019 USD ($) employee country segment Location customer	Dec. 31, 2018 USD ($)		Dec. 31, 2017 USD ($)		Dec. 31, 2016 USD ($)
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				6,800
Percentage change in stock price			43.00%
Goodwill impairment loss (see Note 1)	$ 0	$ 0		$ 0	$ 0		$ 75,241,000
Goodwill				282,006,000	281,650,000		284,804,000
Accumulated goodwill impairment loss				75,200,000	75,200,000
Deferred tax assets, gross				73,241,000	73,717,000
Valuation allowance				14,912,000	10,549,000
Deferred tax liabilities				60,136,000	61,622,000
Unrecognized tax benefits				$ 1,547,000	1,749,000	[1]	$ 991,000	[1]	$ 716,000
US Federal income tax rate				21.00%			35.00%
Adjustments to December 31, 2018 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				1,000,000
General liability claims, deductible per occurrence				2,000,000
Medical claims, our self-insured retention				350,000
Environmental liability claims, our self-insured retention				1,000,000
Accrued capital expenditures				4,000,000	1,400,000		$ 2,600,000
MS
Significant Accounting Policies [Line Items]
Goodwill impairment loss (see Note 1)							54,100,000
Goodwill				55,409,000	55,627,000		56,600,000
IHT
Significant Accounting Policies [Line Items]
Goodwill impairment loss (see Note 1)							21,100,000
Goodwill				193,216,000	192,608,000		$ 194,211,000
Carrying value of net assets				217,000,000
Significant Other Observable Inputs (Level 2) | Convertible debt
Significant Accounting Policies [Line Items]
Fair value of convertible senior notes				$ 241,700,000	$ 231,500,000
Sales Revenue | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Number of customers that accounted for more than ten percent of revenue | customer				0

[1] 2018 and 2017 revised figures were not considered material. Penalties and interest were excluded in 2019, therefore 2018 and 2017 amounts were revised for consistency.