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Senior Convertible Notes - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended			275 Months Ended	0 Months Ended			0 Months Ended
	Dec. 15, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Aug. 18, 2010 Senior convertible notes due August 15 2015 D	Dec. 31, 2013 Senior convertible notes due August 15 2015	Dec. 31, 2012 Senior convertible notes due August 15 2015	Dec. 12, 2006 Senior convertible notes due December 15, 2013	Dec. 31, 2013 Senior convertible notes due December 15, 2013	Dec. 31, 2012 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	$ 15,000,000
Senior notes, effective interest rate						5.75%			3.75%
Accrued interest							2,400,000	2,200,000		0	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%
Trading days						20
Consecutive trading days						30 days
Issuance cost						4,200,000			3,700,000
Debt instrument settlement amount	115,000,000	115,000,000			115,000,000
Accretion of debt issuance costs		$ 1,400,000	$ 1,400,000	$ 1,300,000

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