Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Detail) (Not Designated as Hedging Instruments [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Not Designated as Hedging Instruments [Member]
Derivatives not Designated as Hedging Instruments
Gross amounts recognized	$ 14,012	$ 24,262
Gross amounts offset	(314)	(514)
Net amounts presented in the Consolidated Balance Sheets	13,698	23,748
Net Amount	13,698	23,748
Gross amounts recognized	13,961	24,036
Gross amounts offset	(314)	(514)
Net amounts presented in the Consolidated Balance Sheets	13,647	23,522
Gross amounts not offset	(12,611)	(19,595)
Net Amount	$ 1,036	$ 3,927