Remaining Maturities of Short Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Short-term Debt [Line Items]
Short-term debt	$ 862,763	$ 551,918
Within 30 Days
Short-term Debt [Line Items]
Short-term debt	659,262	362,279
31 to 90 Days
Short-term Debt [Line Items]
Short-term debt	54,434	48,848
Over 90 Days
Short-term Debt [Line Items]
Short-term debt	$ 149,067	$ 140,791