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Hedging Activities - Fair Value of Our Derivatives and Consolidated Balance Sheet Location (Detail) (Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Fair Value	$ 2,346	$ 7,105
Interest Rate Swap \| Accrued Expenses
Derivatives, Fair Value [Line Items]
Fair Value	2,346	5,194
Interest Rate Swap \| Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Fair Value		$ 1,911

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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