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Hedging Activities - Fair Value of Our Derivatives and Consolidated Balance Sheet Location (Detail) (Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Fair Value	$ 695	$ 2,346
Interest Rate Swap [Member] \| Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Fair Value	$ 695	$ 2,346

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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