DEBT - Components of Interest Expense (Detail) (2016 Convertible Senior Notes, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
2016 Convertible Senior Notes
Debt Instrument [Line Items]
Amortization of the discount on the liability component	$ 1,822	$ 1,633	$ 5,256	$ 4,865
Cash interest related to the contractual interest coupon	853	807	2,491	2,438
Total	$ 2,675	$ 2,440	$ 7,747	$ 7,303