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Long-Term Debt - Summary of Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total long-term debt	$ 128,865	$ 126,932
Senior Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	40,250	40,250
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 88,615	$ 86,682

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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