ACQUISITIONS - Additional Information (Detail) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015 USD ($) Entity	Mar. 31, 2015 USD ($) Entity	Mar. 31, 2014 USD ($)	Jun. 30, 2015 USD ($) Entity	Jun. 30, 2014 USD ($)
Business Acquisition [Line Items]
Number of acquisitions	8	15		23
Net increase in goodwill | $				$ 56,500
Tax deductible goodwill amount | $	$ 21,000			21,000
Net increase in Intangible Assets | $				41,300
Selling, general and administrative expenses
Business Acquisition [Line Items]
Acquisition related expenses | $		$ 2,986	$ 3,979	6,282	$ 7,200
Operating permits
Business Acquisition [Line Items]
Acquired indefinite-lived intangible assets | $				1,400
Customer relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets | $				$ 39,900
Acquired finite-lived intangible assets, useful life				23 years 3 months 18 days
Customer relationships | Minimum
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, useful life				15 years
Customer relationships | Maximum
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, useful life				40 years
Brazil
Business Acquisition [Line Items]
Number of acquisitions				2
Ireland
Business Acquisition [Line Items]
Number of acquisitions				1
Mexico
Business Acquisition [Line Items]
Number of acquisitions				2
Romania
Business Acquisition [Line Items]
Number of acquisitions				2
Republic of Korea
Business Acquisition [Line Items]
Number of acquisitions				3
Spain
Business Acquisition [Line Items]
Number of acquisitions				1
Canada
Business Acquisition [Line Items]
Number of acquisitions				1
Netherlands
Business Acquisition [Line Items]
Number of acquisitions				1
United States
Business Acquisition [Line Items]
Net increase in goodwill | $				$ 32,400
United States | Communication Services
Business Acquisition [Line Items]
Number of acquisitions	1
United States | Acquisition One | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions	1	1
Business acquisition, ownership percentage acquired	100.00%	100.00%		100.00%
United States | Acquisition Two | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions	4	3
International
Business Acquisition [Line Items]
Net increase in goodwill | $				$ 24,100
International | Brazil | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions		2
Business acquisition, ownership percentage acquired		100.00%
International | Ireland | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions		1
Business acquisition, ownership percentage acquired		100.00%
International | Mexico | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions		2
Business acquisition, ownership percentage acquired		100.00%
International | Romania | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions		2
International | Republic of Korea | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions		3
International | Spain | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions		1
International | Canada | Communication Services
Business Acquisition [Line Items]
Number of acquisitions	1
Business acquisition, ownership percentage acquired	100.00%			100.00%
International | Netherlands | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions	1
Business acquisition, ownership percentage acquired	100.00%			100.00%