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Royalty Monetization - Schedule of Redemption Percentage of Notes (Detail)
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12 Months Ended |
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Dec. 31, 2013
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| Royalty Monetization [Abstract] | |
| From and including March 9, 2013 to and including March 8, 2014 | 103.50% |
| From and including March 9, 2014 and thereafter | 100.00% |