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Debt - Schedule of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Credit Facility	$ 228,850
Less current portion	(17,300)	(10,600)
Debt, net of current portion	211,104	221,726
2013 Credit Facility
Debt Instrument [Line Items]
Credit Facility	228,404
2010 Credit Facility
Debt Instrument [Line Items]
Credit Facility		$ 232,326

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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