Derivative Financial Instruments (Detail) (Derivatives Designated as Hedges, USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Asset derivatives fair value	$ 13,288	$ 26,081
Liability derivatives fair value	42,055	4,647
Other assets
Derivative [Line Items]
Asset derivatives fair value	1,647	13,770
Other liabilities
Derivative [Line Items]
Liability derivatives fair value	21,846	1,043
Accounts receivable-other
Derivative [Line Items]
Asset derivatives fair value	11,641	12,311
Accounts payable
Derivative [Line Items]
Liability derivatives fair value	$ 20,209	$ 3,604