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