DEBT (Components of Interest Expense) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
2016 Convertible Senior Notes
Debt Instrument [Line Items]
Amortization of the discount on the liability component	$ 1,622	$ 1,763	$ 3,232	$ 3,502
Cash interest related to the contractual interest coupon	813	934	1,631	1,869
Total	2,435	2,697	4,863	5,371
2012 Senior Convertible Notes
Debt Instrument [Line Items]
Amortization of the discount on the liability component	0	1,206	0	2,995
Cash interest related to the contractual interest coupon	0	653	0	1,633
Total	$ 0	$ 1,859	$ 0	$ 4,628