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Derivative Instruments and Hedging Activities - Schedule of Pre-tax Effect of Derivative Financial Instruments on Statement of Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Derivatives in Cash Flow Hedging Relationships:
Gain (loss) related to effective portion of derivatives recognized in accumulated other comprehensive income	$ 672
Gain (loss) related to effective portion of derivatives reclassified from accumulated other comprehensive income to interest expense	(340)
Gain (loss) related to ineffective portion of derivatives recognized in other income (expense)

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 portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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- Definition

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

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