Risk Management And Derivatives (Changes In Foreign Currency Exchange Rates And Derivative Foreign Currency Forward Contracts) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Foreign Currency Exchange Gain Loss [Line Items]
Unrealized foreign currency exchange rate gains (losses)	$ (1,905)	$ 2,464	$ (4,027)
Foreign Currency Exchange Rates [Member]
Foreign Currency Exchange Gain Loss [Line Items]
Unrealized foreign currency exchange rate gains (losses)	(1,905)	2,464	(4,027)
Realized foreign currency exchange rate gains (losses)	477	(182)	298
Foreign Currency Forward Contracts [Member]
Foreign Currency Exchange Gain Loss [Line Items]
Unrealized derivative gains (losses)	13	675	(31)
Realized derivative gains (losses)	$ (243)	$ 3,030	$ (1,696)