DEBT - Components of Interest Expense (Detail) (2016 Convertible Senior Notes, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
2016 Convertible Senior Notes
Debt Instrument [Line Items]
Amortization of the discount on the liability component	$ 1,766	$ 1,622	$ 3,433	$ 3,232
Cash interest related to the contractual interest coupon	837	813	1,639	1,631
Total	$ 2,603	$ 2,435	$ 5,072	$ 4,863