FAIR VALUE MEASUREMENTS - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Payments to acquire short-term investments	$ 636,200
Derivative asset	1,111		$ 1,111		$ 1,111		$ 515
Cash received on settled hedge		$ 8,800			8,833	$ 0
Settlement of hedge, amount recognized in accumulated other comprehensive income		5,300	(216)	$ (159)	(3,994)	(308)
Settlement of hedge, tax amount recognized in accumulated other comprehensive income		$ 3,500	79	$ 0	2,577	$ 47
Contingent consideration liabilities	25,835		25,835		25,835		19,941
Debt obligations, carrying amount	1,516,092		1,516,092		1,516,092		1,659,215
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maximum contingent liability if financial performance measures were fully met	45,200		45,200		45,200
Level 3 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	0		0		0		0
Contingent consideration liabilities	25,835		25,835		25,835		19,941
Level 3 Inputs [Member] | Current Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liabilities	8,900		8,900		8,900
Level 2 Inputs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	1,111		1,111		1,111		515
Contingent consideration liabilities	0		0		0		0
Debt obligations, fair value	$ 1,520,000		$ 1,520,000		$ 1,520,000		$ 1,670,000