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Carrying Value of Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 778,512	$ 755,383
Less current portion of term credit facility	53,227	47,313
Total long-term debt	725,285	708,070
Term credit facility
Debt Instrument [Line Items]
Total debt	446,512	455,383
Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	32,000
6.375% Senior Notes, due August 2020
Debt Instrument [Line Items]
Total debt	$ 300,000	$ 300,000

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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