Derivative Instruments and Hedging Activities - Fair Value of Derivative Financial Instruments and Their Classification on Balance Sheet (Detail) (Interest Rate Contract, USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 1,162	$ 197
Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	1,021	3,332
Not Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	2,847	6,103
Not Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 2,932	$ 6,434