DEBT (Components of Interest Expense) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
2016 Convertible Senior Notes
Debt Instrument [Line Items]
Amortization of the discount on the liability component	$ 1,788	$ 1,691	$ 5,289	$ 2,026
Cash interest related to the contractual interest coupon	934	934	2,803	1,090
Total	2,722	2,625	8,092	3,116
2012 Senior Convertible Notes
Debt Instrument [Line Items]
Amortization of the discount on the liability component	0	1,726	2,995	5,093
Cash interest related to the contractual interest coupon	0	980	1,633	2,940
Total	$ 0	$ 2,706	$ 4,628	$ 8,033