v2.4.0.8

Total Obligations Under Notes (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Senior Secured Notes due 2016 Secured Debt | Dec. 31, 2012 Senior Secured Notes due 2016 Secured Debt | Mar. 07, 2008 Convertible Senior Notes Due 2013 | Mar. 31, 2013 Convertible Senior Notes Due 2013 Secured Debt | Dec. 31, 2012 Convertible Senior Notes Due 2013 Secured Debt | Mar. 31, 2013 Senior Notes due March 18, 2013 (New Debt) | Dec. 31, 2012 Senior Notes due March 18, 2013 (New Debt) | Mar. 31, 2013 Senior Notes due March 18, 2013 (New Debt) Secured Debt Roust Trading Limited | Dec. 31, 2012 Senior Notes due March 18, 2013 (New Debt) Secured Debt Roust Trading Limited
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes (CSN) | $ 257,858 | $ 256,922 |  |  | $ 290,300 | $ 257,858 | $ 257,858 |  |  |  |
Senior Secured Notes due 2016 (SSN) | 928,658 | 944,499 | 931,174 | 947,127 |  |  |  |  |  |  |
Unamortized debt discount |  |  | (2,516) | (2,628) |  | 0 | (148) | (12,700) | (13,600) |  |
Debt discount related to ASC 470-20 |  |  |  |  |  | 0 | (788) |  |  |  |
Debt Security (RTL Notes) |  |  |  |  |  |  |  |  |  | 20,000 | 70,000
Total | $ 20,000 | $ 70,000 |  |  |  |  |  |  |  | $ 20,000 | $ 70,000

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