ACQUISITIONS - Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Oct. 30, 2015	Oct. 08, 2015	Jun. 17, 2015	Feb. 04, 2015	Dec. 31, 2014	Sep. 03, 2014	Aug. 19, 2014	Jun. 06, 2014
Business Acquisition [Line Items]
Goodwill	$ 858,532					$ 862,338
Other intangible assets						142,100
Net assets acquired						$ 297,400
Relay Monitoring Systems PTY Ltd.
Business Acquisition [Line Items]
Current assets		$ 3,605
Property, plant & equipment		1,378
Goodwill		7,584
Other intangible assets		10,426
Total assets acquired		22,993
Total liabilities assumed		(4,283)
Net assets acquired		$ 18,710
Track IQ
Business Acquisition [Line Items]
Current assets			$ 660
Property, plant & equipment			187
Goodwill			6,440
Other intangible assets			3,246
Total assets acquired			10,533
Total liabilities assumed			(1,430)
Net assets acquired			$ 9,103
RCL
Business Acquisition [Line Items]
Current assets					$ 16,421
Property, plant & equipment					11,983
Goodwill					14,940
Other intangible assets					40,403
Total assets acquired					83,747
Total liabilities assumed					(5,736)
Net assets acquired					$ 78,011
C2CE
Business Acquisition [Line Items]
Current assets							$ 9,812
Property, plant & equipment							1,853
Goodwill							15,896
Other intangible assets							3,654
Total assets acquired							31,215
Total liabilities assumed							(5,736)
Net assets acquired							$ 25,479
Metalocaucho
Business Acquisition [Line Items]
Current assets				$ 10,906
Property, plant & equipment				1,510
Goodwill				12,141
Other intangible assets				7,649
Other assets				114
Total assets acquired				32,320
Total liabilities assumed				(8,960)
Net assets acquired				$ 23,360
Dia-Frag
Business Acquisition [Line Items]
Current assets								$ 12,158
Property, plant & equipment								13,749
Goodwill								35,850
Other intangible assets								26,150
Other assets								66
Total assets acquired								87,973
Total liabilities assumed								(17,332)
Net assets acquired								$ 70,641
Fandstan
Business Acquisition [Line Items]
Current assets									$ 124,280
Property, plant & equipment									67,948
Goodwill									62,476
Other intangible assets									50,598
Other assets									216
Total assets acquired									305,518
Total liabilities assumed									(106,114)
Net assets acquired									$ 199,404