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Fair Value of Long-Term Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Carrying value of long-term debt	$ 1,830,318	$ 1,832,800
Fair value of long-term debt	$ 1,827,254	$ 1,815,879

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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