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Effect of Derivative Financial Instruments on Consolidated Statements of Income and Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative [Line Items]
Amount of loss recognized in OCI on derivative (effective portion)	$ 7	$ 800
Derivatives in Cash Flow Hedging Relationships \| Interest Expense \| Interest Rate Swap
Derivative [Line Items]
Amount of loss reclassified from accumulated OCI into income (effective portion)	$ 449	$ 422

- 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.

+ References+ Details

- 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