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Derivative and Hedged Item (Detail) (Interest, Net, USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Interest, Net
       
Derivative Instruments Gain Loss [Line Items]        
Gain (loss) on swap $ (2,381) $ 1,497 $ (3,054) $ 1,263
(Loss) gain on borrowing 2,132 (1,549) 2,680 (1,272)
Hedge Ineffectiveness $ (249) $ (52) $ (374) $ (9)