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Effect of Derivative Instruments on Consolidated Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Amount of loss recognized in OCI on derivative (effective portion)	$ 1,797	$ 3,445
Interest Rate Swap [Member] \| Derivatives in Cash Flow Hedging Relationships \| Interest Expense
Derivative [Line Items]
Amount of loss reclassified from accumulated OCI into income (effective portion)	$ 1,754	$ 898

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

The effective portion of losses on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References+ Details