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Summary of Senior Convertible Notes (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 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	Sep. 30, 2013 Senior convertible notes due August 15 2015	Dec. 31, 2012 Senior convertible notes due August 15 2015	Aug. 18, 2010 Senior convertible notes due August 15 2015
Debt Instrument [Line Items]
Principal amount			$ 115,000	$ 115,000	$ 115,000	$ 100,000	$ 100,000	$ 100,000
Unaccreted debt issuance expense			(103)	(557)		(1,780)	(2,417)
Net carrying amount			114,897	114,443		98,220	97,583
Senior convertible notes	$ 213,117	$ 212,026

X

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

+ References

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Face (par) amount of debt instrument at time of issuance.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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