DEBT (Components of Interest Expense) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
2016 Convertible Senior Notes
Debt Instrument [Line Items]
Amortization of the discount on the liability component	$ 1,610	$ 1,739
Cash interest related to the contractual interest coupon	818	934
Total	2,428	2,673
2012 Senior Convertible Notes
Debt Instrument [Line Items]
Amortization of the discount on the liability component	0	1,789
Cash interest related to the contractual interest coupon	0	980
Total	$ 0	$ 2,769