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Senior Convertible Notes - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended |  |  | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Aug. 18, 2010 Senior convertible notes due August 15 2015 | Dec. 31, 2012 Senior convertible notes due August 15 2015 | Dec. 31, 2011 Senior convertible notes due August 15 2015 | Dec. 12, 2006 Senior convertible notes due December 15, 2013 | Dec. 31, 2012 Senior convertible notes due December 15, 2013 | Dec. 31, 2011 Senior convertible notes due December 15, 2013 | Dec. 31, 2010 Senior convertible notes due December 15, 2013 | Dec. 12, 2006 Senior convertible notes due December 15, 2013 Underwriters Overallotment Option
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 100,000,000 | $ 100,000,000 | $ 100,000,000 | $ 115,000,000 | $ 115,000,000 | $ 115,000,000 |  | $ 15,000,000
Senior notes, effective interest rate |  |  | 5.75% |  |  | 3.75% | 3.75% |  |  |
Accrued interest |  |  |  | 2,200,000 | 2,200,000 |  | 192,000 | 192,000 | 192,000 |
No of convertible shares |  |  | 147.0859 |  |  | 44.5002 |  |  |  |
Principal amount per share |  |  | $ 1,000 |  |  | $ 1,000 |  |  |  |
Conversion price of shares |  |  |  | $ 6.80 |  |  | $ 22.47 |  |  |
Percentage of repurchase price |  |  | 100.00% |  |  | 100.00% |  |  |  |
Percentage of conversion price equaling stock price |  |  | 150.00% |  |  |  |  |  |  |
Percentage of redemption price |  |  | 100.00% |  |  |  |  |  |  |
Consecutive trading days |  |  | Least 20 of the 30 |  |  |  |  |  |  |
Issuance cost |  |  | 4,200,000 |  |  | 3,700,000 |  |  |  |
Accretion of debt issuance costs | $ 1,400,000 | $ 1,300,000 |  |  |  |  |  |  |  |

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