FAIR VALUE MEASUREMENTS - Additional Information (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative asset	$ 300,000	$ 400,000
Contingent consideration liabilities	10,500,000	12,400,000
Debt obligations, carrying amount	2,658,700,000	2,747,200,000
Maximum
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Maximum contingent liability if financial performance measures were fully met	13,600,000
Level 3 Inputs [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Contingent consideration liabilities	10,500,000	12,400,000
Level 3 Inputs [Member] | Other Current Liabilities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Contingent consideration liabilities	2,800,000	4,600,000
Level 2 Inputs [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative asset	300,000	400,000
Debt obligations, fair value	$ 2,620,000,000	$ 2,740,000,000