Derivatives - Fair Value of Derivative Contracts (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value Disclosures [Line Items]
Derivative contacts, Assets	$ 1,634	$ 782
Derivative contacts, Liabilities	1,851	338
Interest Rate Swaps [Member]
Fair Value Disclosures [Line Items]
Derivative contacts, Assets	445	782
Derivative contacts, Liabilities
Foreign Exchange Swaps [Member]
Fair Value Disclosures [Line Items]
Derivative contacts, Assets	501
Derivative contacts, Liabilities	926	338
Equity Options [Member]
Fair Value Disclosures [Line Items]
Derivative contacts, Assets	688
Derivative contacts, Liabilities	$ 925