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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	$ 2,312	$ 628
Current maturities on long-term debt	44,050us-gaap_LongTermDebtCurrent	14,050us-gaap_LongTermDebtCurrent
Long-term debt	1,586,435us-gaap_LongTermDebtNoncurrent	1,589,403us-gaap_LongTermDebtNoncurrent
Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments	$ 2,312	$ 628

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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