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FAIR VALUE MEASUREMENTS - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative asset $ 753 $ 1,207
Contingent consideration liabilities 22,668 25,390
Debt obligations, carrying amount 3,022,598 3,214,048
Maximum    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Maximum contingent liability if financial performance measures were fully met 39,700  
Level 3 Inputs [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative asset 0 0
Contingent consideration liabilities 22,668 25,390
Level 3 Inputs [Member] | Current Liabilities [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Contingent consideration liabilities 8,200 9,100
Level 2 Inputs [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative asset 753 1,207
Contingent consideration liabilities 0 0
Debt obligations, fair value $ 2,980,000 $ 3,220,000