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Debt - Schedule of Debt (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Less current portion	$ (9,460,000)us-gaap_LongTermDebtCurrent	$ (17,300,000)us-gaap_LongTermDebtCurrent
Debt, net of current portion	202,213,000us-gaap_LongTermDebtNoncurrent	211,104,000us-gaap_LongTermDebtNoncurrent
2013 Senior Secured Credit Facility
Debt Instrument [Line Items]
2013 Senior Secured Credit Facility, principal of $538 payable quarterly, matures in July 2020, net of unamortized discount of $360 and $446 as of December 31, 2014 and 2013, respectively	$ 211,673,000	$ 228,404,000

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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