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Debt - Schedule of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Less current portion	$ (12,725)us-gaap_LongTermDebtCurrent	$ (9,460)us-gaap_LongTermDebtCurrent
Debt, net of current portion	190,605us-gaap_LongTermDebtNoncurrent	202,213us-gaap_LongTermDebtNoncurrent
2013 Senior Secured Credit Facility
Debt Instrument [Line Items]
2013 Senior Secured Credit Facility, principal of $520 payable quarterly, matures in July 2020, net of unamortized discount of $864 and $360 as of March 31, 2015 and December 31, 2014, respectively	$ 203,330	$ 211,673

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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