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Senior Convertible Notes - Additional Information (Detail) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Aug. 18, 2010 Senior convertible notes due August 15, 2015 D	Mar. 31, 2014 Senior convertible notes due August 15, 2015	Dec. 31, 2013 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	1,300,000			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
Accretion of debt issuance costs	$ 223,000	$ 209,000

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