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Financial Instruments - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Fair Value Disclosures [Abstract]
Long-term debt, carrying values	$ 1,581,023,000us-gaap_LongTermDebt	$ 1,585,395,000us-gaap_LongTermDebt	$ 1,067,944,000us-gaap_LongTermDebt
Long-term debt, fair values	$ 1,691,478,000us-gaap_LongTermDebtFairValue	$ 1,680,584,000us-gaap_LongTermDebtFairValue	$ 1,127,149,000us-gaap_LongTermDebtFairValue

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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