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FAIR VALUE MEASUREMENTS - Additional Information (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative asset $ 719 $ 1,207
Contingent consideration liabilities 23,357 25,390
Debt obligations, carrying amount 3,129,099 3,214,048
Maximum    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Maximum contingent liability if financial performance measures were fully met 40,700  
Level 3 Inputs [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative asset 0 0
Contingent consideration liabilities 23,357 25,390
Level 3 Inputs [Member] | Current Liabilities [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Contingent consideration liabilities 7,500 9,100
Level 2 Inputs [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative asset 719 1,207
Contingent consideration liabilities 0 0
Debt obligations, fair value $ 3,080,000 $ 3,220,000