GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended				9 Months Ended															3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Segment Reporting_unit	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014 Customer relationships	Sep. 30, 2014 Customer relationships Minimum	Sep. 30, 2014 Customer relationships Maximum	Sep. 30, 2014 Covenants not-to-compete	Sep. 30, 2014 Covenants not-to-compete Minimum	Sep. 30, 2014 Covenants not-to-compete Maximum	Sep. 30, 2014 Tradenames	Sep. 30, 2014 Tradenames Minimum	Sep. 30, 2014 Tradenames Maximum	Sep. 30, 2014 Technology	Sep. 30, 2014 Market Approach Goodwill Impairment Test [Member]	Sep. 30, 2014 Domestic Regulated and Compliance Services [Member] Income Approach Goodwill Impairment Test [Member]	Sep. 30, 2014 Domestic Regulated Recall and Returns Management Services [Member] Income Approach Goodwill Impairment Test [Member]	Jun. 30, 2014 International Regulated and Compliance Services [Member]	Sep. 30, 2014 International Regulated and Compliance Services [Member] Income Approach Goodwill Impairment Test [Member]	Sep. 30, 2014 Operating permits
Intangible Assets by Major Class [Line Items]
Number of geographical reportable segments			2
Number of reporting units			3
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount																	100.00%	100.00%	100.00%		85.00%
Goodwill	$ 2,415,210,000		$ 2,415,210,000		$ 2,231,582,000	$ 2,065,103,000														$ 576,700,000
Write off of permit intangibles																						1,400,000
Finite-lived intangible assets, useful life								10 years	40 years		3 years	14 years		10 years	40 years	5 years
Finite lived intangible assets, weighted average remaining useful life							23 years 8 months 12 days			3 years 4 months 24 days			15 years 1 month 6 days			1 year 3 months 18 days
Aggregate amortization expense	$ 8,497,000	$ 6,709,000	$ 24,214,000	$ 19,884,000