STOCK BASED COMPENSATION - Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Number of Options
Outstanding as of January 1, 2017			5,468,732
Granted	18,015	55,100	454,799	1,095,207
Exercised			(119,631)
Forfeited			(105,117)
Cancelled or expired			(108,479)
Outstanding as of September 30, 2017	5,590,304		5,590,304
Exercisable as of September 30, 2017	3,572,197		3,572,197
Weighted Average Exercise Price per Share
Outstanding as of January 1, 2017			$ 96.90
Granted			82.95
Exercised			50.54
Forfeited			112.63
Cancelled or expired			101.17
Outstanding as of September 30, 2017	$ 96.38		96.38
Exercisable as of September 30, 2017	$ 89.48		$ 89.48
Weighted Average Remaining Contractual Life
Outstanding as of September 30, 2017			4 years 9 months 25 days
Exercisable as of September 30, 2017			4 years 1 month 13 days
Total Aggregate Intrinsic Value
Outstanding as of September 30, 2017	$ 17,312		$ 17,312
Exercisable as of September 30, 2017	$ 17,311		$ 17,311