Amounts of Unrealized and Realized Net losses and Changes in Fair Value of Forward Contracts (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative [Line Items]
Amount of Realized Net Gains (Losses) and Changes in the Fair Value of Forward Contracts	$ 398	$ 1,146	$ 436	$ 1,419
Interest and Other, net
Derivative [Line Items]
Amount of Realized Net Gains (Losses) and Changes in the Fair Value of Forward Contracts	400	1,146	276	1,419
Discontinued Operations
Derivative [Line Items]
Amount of Realized Net Gains (Losses) and Changes in the Fair Value of Forward Contracts	$ (2)		$ 160