FAIR VALUE MEASUREMENTS - Additional Information (Detail) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative asset	$ 400,000	$ 800,000
Contingent consideration liabilities	12,400,000	24,100,000
Debt obligations, carrying amount	2,747,200,000	2,959,300,000
Maximum
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Maximum contingent liability if financial performance measures were fully met	15,700,000
Level 3 Inputs [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative asset	0	0
Contingent consideration liabilities	12,400,000	24,100,000
Level 3 Inputs [Member] | Current Liabilities [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Contingent consideration liabilities	4,600,000	8,100,000
Level 2 Inputs [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Derivative asset	400,000	800,000
Contingent consideration liabilities	0	0
Debt obligations, fair value	$ 2,740,000,000	$ 2,970,000,000