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Senior Convertible Notes - Additional Information (Detail) (USD $)	1 Months Ended			1 Months Ended
	Aug. 18, 2010 Senior convertible notes due August 15 2015	Jun. 30, 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	Jun. 30, 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	$ 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
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 for which closing stock price is equal to 150% of conversion price	At least 20 of the 30
Issuance cost	$ 4,200,000			$ 3,700,000

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