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Senior Convertible Notes - Additional Information (Detail) (USD $) | 0 Months Ended |  |  |
--- | --- | --- | --- | ---
Aug. 18, 2010 D | Jun. 30, 2014 | Dec. 31, 2013 | Aug. 18, 2010
Debt Instrument [Line Items] |  |  |  |
Accrued interest |  | $ 2,000,000 |  |
Senior convertible notes due August 15, 2015 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | 100,000,000 | 100,000,000 | 100,000,000
Senior notes, effective interest rate |  | 5.75% |  | 5.75%
Accrued interest |  | 2,400,000 | 2,400,000 |
No of convertible shares | 147.0859 |  |  |
Principal amount per share | $ 1,000 |  |  |
Conversion price of shares |  |  |  | $ 6.80
Percentage of repurchase price | 100.00% |  |  |
Percentage of conversion price equaling stock price | 150.00% |  |  |
Trading days | 20 |  |  |
Consecutive trading days | 30 days |  |  |
Issuance cost |  |  |  | $ 4,200,000

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