FAIR VALUE MEASUREMENTS - Fair Value Measurements (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets:
Cash and cash equivalents	$ 32,883	$ 22,236
Short-term investments	636,288	380
Derivative financial instruments	1,111	515
Total assets	670,282	23,131
Liabilities:
Contingent consideration	25,835	19,941
Derivative financial instruments		2,408
Total liabilities	25,835	22,349
Level 1 Inputs [Member]
Assets:
Cash and cash equivalents	32,883	22,236
Short-term investments	636,288	380
Derivative financial instruments	0	0
Total assets	669,171	22,616
Liabilities:
Contingent consideration	0	0
Derivative financial instruments		0
Total liabilities	0	0
Level 2 Inputs [Member]
Assets:
Cash and cash equivalents	0	0
Short-term investments	0	0
Derivative financial instruments	1,111	515
Total assets	1,111	515
Liabilities:
Contingent consideration	0	0
Derivative financial instruments		2,408
Total liabilities	0	2,408
Level 3 Inputs [Member]
Assets:
Cash and cash equivalents	0	0
Short-term investments	0	0
Derivative financial instruments	0	0
Total assets	0	0
Liabilities:
Contingent consideration	25,835	19,941
Derivative financial instruments		0
Total liabilities	$ 25,835	$ 19,941