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Changes in Fair Value of Swaps (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Change in fair value:
Recognized in earnings	$ 51	$ (16)	$ 61	$ (19)
Recognized in other comprehensive income	1,763	(1,466)	2,264	(912)
Increase / (decrease) in fair value of interest rate swaps, net, Total	$ 1,814	$ (1,482)	$ 2,325	$ (931)

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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