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Senior Convertible Notes - Additional Information (Detail) (Senior convertible notes due August 15, 2015, USD $)	0 Months Ended
	Aug. 18, 2010 D	Sep. 30, 2014	Dec. 31, 2013	Aug. 18, 2010
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		1,000,000	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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The price per share of the conversion feature embedded in the debt instrument.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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