GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Detail)	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($) Segment	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Intangible Assets By Major Class [Line Items]
Goodwill impairment charge									$ 0
Indefinite-lived assets impairment charges									1,406,000	$ 4,177,000
Aggregate intangible amortization expense	$ 26,989,000	$ 33,128,000	$ 50,909,000	$ 18,274,000	$ 18,541,000	$ 9,239,000	$ 8,921,000	$ 8,797,000	$ 129,300,000	45,498,000	$ 32,692,000
Customer relationships
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, weighted average remaining useful life									15 years 2 months 12 days
Customer relationships | Minimum
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, useful life									5 years
Customer relationships | Maximum
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, useful life									40 years
Covenants not-to-compete
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, weighted average remaining useful life									3 years 6 months
Covenants not-to-compete | Minimum
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, useful life									5 years
Covenants not-to-compete | Maximum
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, useful life									14 years
Tradenames
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, weighted average remaining useful life									17 years 7 months 6 days
Tradenames | Minimum
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, useful life									10 years
Tradenames | Maximum
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, useful life									40 years
Other intangibles
Intangible Assets By Major Class [Line Items]
Finite-lived intangible assets, weighted average remaining useful life									17 years 4 months 24 days
International Regulated and Compliance Services
Intangible Assets By Major Class [Line Items]
Number of reporting units | Segment	3
Aggregate intangible amortization expense									$ 25,730,000	14,926,000	13,298,000
Domestic and Canada RCS
Intangible Assets By Major Class [Line Items]
Number of reporting units | Segment	4
Aggregate intangible amortization expense									$ 95,640,000	$ 22,714,000	$ 12,728,000