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Fair Value of Financial Instruments - Fair Value of Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Long-term debt, Recorded Amount	$ 1,052,375	$ 1,078,864
Long-term debt, Fair Value	$ 1,079,648	$ 1,109,878

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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