Risk Management And Derivatives (Changes In Foreign Currency Exchange Rates And Derivative Foreign Currency Forward Contracts) (Detail) (USD $)	9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Foreign Currency Exchange Rates [Member]	Sep. 30, 2012 Foreign Currency Exchange Rates [Member]	Sep. 30, 2013 Foreign Currency Exchange Rates [Member]	Sep. 30, 2012 Foreign Currency Exchange Rates [Member]	Sep. 30, 2013 Foreign Currency Forward Contracts [Member]	Sep. 30, 2012 Foreign Currency Forward Contracts [Member]	Sep. 30, 2013 Foreign Currency Forward Contracts [Member]	Sep. 30, 2012 Foreign Currency Forward Contracts [Member]	Sep. 30, 2013 Interest Rate Swap [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Interest Rate Swap [Member] Fair Value, Inputs, Level 2 [Member]
Foreign Currency Exchange Gain Loss [Line Items]
Interest Rate Derivatives, at Fair Value, Net												$ 835,000	$ 0
Foreign Currency Contract, Asset, Fair Value Disclosure			4,800
Maturity of foreign currency forward contract	1 month
Unrealized foreign currency exchange rate gains (losses)	(1,021,000)	2,405,000		596,000	3,313,000	(1,021,000)	2,405,000
Realized foreign currency exchange rate gains (losses)				374,000	(1,266,000)	168,000	(1,000)
Unrealized derivative gains (losses)								(35,000)	27,000	(61,000)	579,000
Realized derivative gains (losses)								$ 1,048,000	$ 2,105,000	$ (244,000)	$ 2,422,000