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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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