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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Carrying Amounts and Estimated Fair Value of Other Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Disclosure [Line Items]
Long-term debt, including current portion, Carrying Value	$ 1,334,957	$ 1,324,383
Long-term debt, including current portion, Fair Value	$ 1,413,000	$ 1,382,000

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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