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Long-Term Debt - Long-Term Debt (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long term debt	$ 340,300,000us-gaap_LongTermDebt
Less current maturities	3,750,000us-gaap_LongTermDebtCurrent	3,750,000us-gaap_LongTermDebtCurrent
Long term debt, net current portion	336,563,000us-gaap_LongTermDebtNoncurrent	360,313,000us-gaap_LongTermDebtNoncurrent
Term Loan
Debt Instrument [Line Items]
Long term debt	$ 340,300,000	$ 364,100,000

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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