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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Liabilities:
Derivative financial instruments	$ 2,312	$ 628
Long-term obligations	1,643,398us-gaap_LongTermDebtFairValue	1,615,635us-gaap_LongTermDebtFairValue
Significant Other Observable Inputs (Level 2) [Member]
Liabilities:
Derivative financial instruments	2,312	628
Long-term obligations	1,378,925	1,352,438
Significant Unobservable Inputs (Level 3) [Member]
Liabilities:
Long-term obligations	$ 264,473	$ 263,197

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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