ACQUISITIONS - Additional Information (Detail) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2015 USD ($) Entity	Jun. 30, 2015 Entity	Mar. 31, 2015 Entity	Sep. 30, 2015 USD ($) Entity	Sep. 30, 2014 USD ($)
Business Acquisition [Line Items]
Number of acquisitions	10	8	15	33
Net increase in goodwill | $				$ 85.4
Tax deductible goodwill amount | $	$ 28.0			28.0
Net increase in Intangible Assets | $				70.3
Selling, general and administrative expenses
Business Acquisition [Line Items]
Acquisition related expenses | $				40.0	$ 10.7
Operating permits
Business Acquisition [Line Items]
Acquired indefinite-lived intangible assets | $				1.4
Tradenames
Business Acquisition [Line Items]
Acquired indefinite-lived intangible assets | $				4.2
Customer relationships
Business Acquisition [Line Items]
Acquired finite-lived intangible assets | $				$ 64.7
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
Canada
Business Acquisition [Line Items]
Number of acquisitions				1
Ireland
Business Acquisition [Line Items]
Number of acquisitions				1
Mexico
Business Acquisition [Line Items]
Number of acquisitions				2
Netherlands
Business Acquisition [Line Items]
Number of acquisitions				1
Romania
Business Acquisition [Line Items]
Number of acquisitions				4
Republic of Korea
Business Acquisition [Line Items]
Number of acquisitions				6
Spain
Business Acquisition [Line Items]
Number of acquisitions				3
United States
Business Acquisition [Line Items]
Net increase in goodwill | $				$ 56.6
United States | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions	2
United States | Communication Services
Business Acquisition [Line Items]
Number of acquisitions	1	1
Business acquisition, ownership percentage acquired	100.00%			100.00%
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%
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 | $				$ 28.8
International | Brazil | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions			2
Business acquisition, ownership percentage acquired			100.00%
International | Canada | Communication Services
Business Acquisition [Line Items]
Number of acquisitions		1
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 | Netherlands | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions		1
Business acquisition, ownership percentage acquired		100.00%
International | Romania | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions			2
International | Romania | Acquisition One | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions	1
Business acquisition, ownership percentage acquired	100.00%			100.00%
International | Romania | Acquisition Two | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions	1
International | Republic of Korea | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions	3		3
International | Spain | Regulated and Compliance Solutions
Business Acquisition [Line Items]
Number of acquisitions	2		1