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Estimated Fair Values and Related Carrying Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	$ 2,389	$ 3,005
Forward Starting Interest Rate Swap Agreement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying Value	2,389	3,005
Fair Value	2,389	3,005
4.375% Senior Notes, due 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Note, Carrying Value	250,000	250,000
Fair Value	$ 264,633	$ 253,135

Fair value, after the 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

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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