GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Detail) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($) Segment	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Segment	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Intangible Assets by Major Class [Line Items]
Number of geographical reportable segments | Segment		2		2
Number of reporting units | Segment				3
Goodwill	$ 2,454,092			$ 2,454,092		$ 2,418,832	$ 2,231,582
Intangible assets, net	908,176			908,176		909,645
Intangible assets, (increase) decrease due to currency fluctuations				(22,700)		(44,900)
Aggregate amortization expense	$ 8,921		$ 8,402	$ 17,718	$ 15,717
Operating permits
Intangible Assets by Major Class [Line Items]
Write off of intangibles		$ 1,200
Customer relationships
Intangible Assets by Major Class [Line Items]
Write off of intangibles		200
Finite lived intangible assets, weighted average remaining useful life				23 years 3 months 18 days
Customer relationships | Minimum
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, useful life				10 years
Finite lived intangible assets, weighted average remaining useful life				15 years
Customer relationships | Maximum
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, useful life				40 years
Finite lived intangible assets, weighted average remaining useful life				40 years
Tradenames
Intangible Assets by Major Class [Line Items]
Write off of intangibles		$ 1,000
Finite lived intangible assets, weighted average remaining useful life				6 years 3 months 18 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
Covenants not-to-compete
Intangible Assets by Major Class [Line Items]
Finite lived intangible assets, weighted average remaining useful life				4 years 2 months 12 days
Covenants not-to-compete | Minimum
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, useful life				3 years
Covenants not-to-compete | Maximum
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, useful life				14 years
Domestic Regulated and Compliance Services | Income Approach Goodwill Impairment Test
Intangible Assets by Major Class [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	100.00%			100.00%
Domestic Regulated Recall and Returns Management Services | Income Approach Goodwill Impairment Test
Intangible Assets by Major Class [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	100.00%			100.00%
International Regulated and Compliance Services
Intangible Assets by Major Class [Line Items]
Goodwill	$ 589,300			$ 589,300
International Regulated and Compliance Services | Income Approach Goodwill Impairment Test
Intangible Assets by Major Class [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	88.00%			88.00%
International
Intangible Assets by Major Class [Line Items]
Goodwill	$ 589,277			$ 589,277		$ 584,517	$ 559,859
International | Puerto Rico | Goodwill
Intangible Assets by Major Class [Line Items]
Retroactive reclassification of goodwill				$ 6,400