ACQUISITIONS - Qualspec (Additional Information) (Details) - USD ($)	Jul. 07, 2015	Jun. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill		$ 361,961,000	$ 256,654,000
Qualspec Group
Business Acquisition [Line Items]
Business acquisition, percentage acquired	100.00%
Business acquisition, purchase price	$ 255,500,000
Business acquisition, contingent consideration	10,000,000
Contingent consideration	5,800,000	$ 0
Acquired intangible assets	78,100,000
Goodwill	148,482,000
Goodwill expected to be deductible for tax purposes	109,600,000
Fair value of accounts receivable acquired	21,495,000
Acquired receivables, gross contractual amount	22,500,000
Acquired receivables, estimated uncollectible	1,000,000
Qualspec Group | Customer Relationships
Business Acquisition [Line Items]
Acquired intangible assets	$ 75,200,000
Acquired intangible asset useful life	15 years
Qualspec Group | Noncompete Agreements
Business Acquisition [Line Items]
Acquired intangible assets	$ 1,600,000
Acquired intangible asset useful life	5 years
Qualspec Group | Trade Names
Business Acquisition [Line Items]
Acquired intangible assets	$ 1,300,000
Acquired intangible asset useful life	1 year