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Effect of Derivative Instruments on Consolidated Statement of Operations (Detail) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Loss Recognized in Earnings	$ (138)	$ (304)	$ (73)	$ (364)
Derivative instrument not designated as hedging instrument \| Interest rate contracts \| Nonoperating Income Expense
Derivative Instruments, Gain (Loss) [Line Items]
Loss Recognized in Earnings	$ (138)	$ (304)	$ (73)	$ (364)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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